Malicious PDF — malware analysis report

Static analysis result for SHA-256 0522c2cb44334650…

MALICIOUS

PDF

84.9 KB Created: 2021-07-02 16:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ecde385decf672b6bcf1c9b55912de71 SHA-1: 7c47efc7206b719f2dd0759fa485d2de81dfe17b SHA-256: 0522c2cb44334650266509d558e33d294f7a3683508c074190049c6e3cbf0269
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. The embedded JavaScript stream, though not fully analyzed, likely contributes to the malicious functionality by facilitating redirection or payload delivery. The primary attack pattern observed is the use of a link farm to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f2256d24---zopiju.pdf In PDF document text
    • http://progetec.org/userfiles/files/gofaposiluna.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8071ce208b---bukokanonafer.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e1a3f277645fc97141f6cfb3e6953752/60698520988.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609896299ebbb---58709599739.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c12i426tdrd3qfg0g5j9t8f1dj/kozoxilewe.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/2908082580.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/vuzor.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zowuneramabixenebepuja.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/4458292179.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2e26973b---xivonemumanonujokomategox.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/16736232436.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/6e27210a55c498a33d51f5ab77f28655/zelanutugi.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8e1782861---wujemofobafaropomo.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/af1818f3959c6d1493d7cc74e84554a0/bixorowap.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51df088e8c---62464124606.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8va0jmclvimpj20no7v4nse21d/36763056464.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e358404ac---496222436.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac25af16077---99085940895.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/85262521384.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81d37c63a---birogowifow.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zaruxefewalimov.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/24npnvburv008c7irvstrr26t6/56959328493.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d46ec6f1b85a6432fd4ba7a730c85818/42727342645.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/jofer.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/nejaro.pdfIn PDF document text
    • http://africareview.in/userfiles/file/rifukaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mesmerism+in+a+sentencePDF 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 10220 bytes
SHA-256: 2b39bb7453f77b2cbf57fda41205a8711051fb95c262f198a2f4051011f5fcae
font_01_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 17512 bytes
SHA-256: cfe882189c66db935f393ee58c9b43a187adaccb196aed129063731b1f45e60e
font_02_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 16852 bytes
SHA-256: 08260be349d910bd3344c5a0331ef621b49a52e215a0c40dc4e5ef0a6361c557