Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cec00149249b2a0…

MALICIOUS

PDF

96.5 KB Created: 2021-09-01 12:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd34c7e9f918752f240fe832803abb52 SHA-1: 889fac3a3a787f662092024ed9482db4c93022f9 SHA-256: 4cec00149249b2a027efe8e81b76b9692fe5bb0d699cfb5aeaa31f0107250dde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16110434fefcd1---72117048207.pdf In PDF document text
    • https://areicon.com/images/file/sanoxijitomojakul.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/zisemaziviledijuguj.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/getorufevisiz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba34b5d2b---gagud.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/zogowovokizazel.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/refofewosokafaxonile.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/42657458271.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/mojat.pdfIn PDF document text
    • https://samowar.me/upload/file/22495121337.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/vetovugu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/d9ha29s3umtmc5q5cuc4tsu5c65jj7fg/sononidijogaxenifoma.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/90eaab0afc5132f7df78dc15fa5b9206/befeluboriwomajo.pdfIn PDF document text
    • http://mebco.ru/images/file/49658536988.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/katefukirikur.pdfIn PDF document text
    • https://apizf.org/public/file/12172113609.pdfIn PDF document text
    • http://zaiger.ru/img/file/19749987803.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/tejetow.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7spj5hh3eucdgo0ntg3vp8m9dt/53125423209.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/varigijibifapesijal.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/98297890722.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59593014235.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/jamorojajamobegofejof.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/segugole.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c10239b8---zipisogad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+write+a+purpose+statement+for+a+research+paperPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 18500 bytes
SHA-256: 6f76c13b0195e5e8f25f84c95b47f55a30f7f437bcb972532d3cfe4dc4b5f370
font_01_sfnt_off0001427d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427D 10876 bytes
SHA-256: 1b3b9bbea0b9aaf3b8f71f444d7f1895e4ebef1211eca39dfdbb6676ad9f2c3f
font_02_sfnt_off00015b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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