Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4aafa3dca3c6e0…

MALICIOUS

PDF

125.8 KB Created: 2021-06-24 14:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 52b0c02d600a2864158fa6da5cf21f07 SHA-1: 1e52a84a85463bd217ab9a17ae3a0d28c5053faa SHA-256: dc4aafa3dca3c6e07ae2ca3da4d7520d6a9a4e86c1fdb9e404f2ec1ca01dfdbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use link farm techniques. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e1f6a3a8---ninete.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/26c404cf5d1ed1ac4697e0ef92172af6/gulakiwozajepumi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a98f7d3cfeb---55441881640.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/guzonado.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097a7a4c3a9e---44783236549.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8008ea71c2dd3bcecf493c336892b299/fipigutu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8da7222ae4c0b61ba5fe6ea6e7edf09c/17526314297.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/acb3158eb4a323acaae9fe7114fc3e0d/71335206782.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15bf39e33---66178008010.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/73738681812.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/komarenikatirobobox.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5f9e27cd163eb9aea6c4cec31629efbc/79893551284.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e9kffant8p1ql4busf39rin3qf/54480483351.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a43df82537a72afdce6bf3dcc6cf34e9/xagoxavofesodapemu.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/49580081506.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i543vmi2lldo1mtg3vnficajvu/pavoripaxamipajiwe.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/q5bcko1ea71q6v9gecfl6brqis/woxarodogafomofavexuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=beyblade+burst+turbo+episode+1+english+subPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off00013d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7A 6372 bytes
SHA-256: 42afca9e218cb9d4428cf64526be5836988cc3f550958342f2490a7b6360a94d
font_02_sfnt_off0001530b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530B 5564 bytes
SHA-256: d9d55ef8f4702fe8d7596134f84a95d58bd44985514a665c7ba8fa2dbdac41b8
font_03_sfnt_off000165f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F9 8772 bytes
SHA-256: 5f78012eda37ce04b149c2a54ef0064ffd70366c0b4d9690b36a191c241d39f4
font_04_sfnt_off0001771b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1771B 7000 bytes
SHA-256: c17afe03918285a3d66e9b46e702ea880568c2b6b60cc96a5477e95ab176fb54
font_05_sfnt_off00018ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA5 16904 bytes
SHA-256: c8eee1794c37d0dba311386c030c5907ef72a0bbe3f39c82eaacd86c0437c74c
font_06_sfnt_off0001c04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C04F 18028 bytes
SHA-256: 87e4e487f67e44e7fff1ceb3db2b27740bbe61968eb6e88127a81fa09cf08b0a
font_07_sfnt_off0001db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB8F 2212 bytes
SHA-256: b20dfb701ebbbf560e5d28d9e95c293cff712d0dfe0022d686d3131a92892e71

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