Malicious PDF — malware analysis report

Static analysis result for SHA-256 763d533a77c7c1e1…

MALICIOUS

PDF

81.9 KB Created: 2021-07-05 02:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88a1467f30472faf0aa2bab133d7513e SHA-1: 255b43e1d33c35fcce1bc1b065cde850abcba67d SHA-256: 763d533a77c7c1e138bd9dd16ba447c4c7d6d2bfdf522c9041c2c774ae3d0005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is indicative of a link farm designed to distribute phishing content or malware. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=how+to+save+image+from+pdf+to+jpg PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96b2a768b---dogujelagizoxirike.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tunavasotaw.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105100416.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160843e9e5cf19---21210316511.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83412e2a65---81155649070.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075389db71af---rorujozuxepikagelefe.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/jetanuwevadawi.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/sazabelodapenilepa.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/51790679885.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa26239005---buwegudafijopunumas.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53d2f2611---96162636667.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/kufamugovamika.pdfIn PDF document text
    • https://amblamy.ee/upload/file/1237801445.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/3d44eb4d83d2dbe63c4f4850108405f1/42078290712.pdfIn PDF document text
    • https://mollis.rs//files/79514142591.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6b7f21d0c3e56d5b5f2d249a0c0a42ae/xijen.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca96472b3c---xibowalonugobuvoruto.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c44e0236ede427ed4ea4389ba9da9d82/16105218649.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/39365255378.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06e44d8b6c---6254021420.pdfIn PDF document text
    • https://tipresentoio.it/images/file/zuzugazirevekud.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/fozokevivulivaronoxatul.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/bt3ndtnbkf2cvobhkn8b1i5p4c/15202550322.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1a894d627f347f42b1181df8925fb906/sojosofetopod.pdfIn PDF document text
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 16832 bytes
SHA-256: 82f38022d56293f4236668983f8169dc54beb9a10ef8420d91364e419b98db18
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 10964 bytes
SHA-256: f57b010f5571abe29dac14272bc287f3d245b0e84db63d89a49449ce1b5993b5

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