Malicious PDF — malware analysis report

Static analysis result for SHA-256 7033231447fdd582…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 12:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b225ac9a6c7d2fcf73d0a4ff8d904c8 SHA-1: 2fd6cf3be4f39e4daa7ccc0dd150ca2048bf83fc SHA-256: 7033231447fdd5826540adf3e19d385647bc8ffbcda621dd201f3d519ede8e96
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161580c58f25d0---45364372467.pdf In PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/41359648279.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0d7jre7q51m82k96bc9a14693m/tututojiruxuwejexokogod.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/fomib.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/10482895252.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/nipuvivameborepav.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/93625126729.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/vegofagobile.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/dabenosike.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/98128241151.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0u0h05pgser8guldu41b7raske/19016595307.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/witite.pdfIn PDF document text
    • http://cwesp.biz/upload/file/dulosirufupulewerozosa.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/rilow.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/rikasafobuposoletoveletur.pdfIn PDF document text
    • https://penzion-palice.cz/content/busurupujanuxulod.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/zesosulokufufowosadetik.pdfIn PDF document text
    • https://pecsikult.hu/files/file/nepabeza.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/17955379228.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/sov6dliv3h92htjqgpmls1c237/mulakenimiguw.pdfIn PDF document text
    • http://irollee.com/userfiles/file/divisiv.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fb4c26a73cff8447fd758e1cb7ecbb94/13219187496.pdfIn PDF document text
    • http://shamayachts.com/upload/file/36034007954.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/65700334406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+5th+wave+full+movie+free+online+streamingPDF 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_off0000b0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A4 16128 bytes
SHA-256: 1a0d0ec1c42957fa13f15dbdf468c84f747511e08690b3665b407c3e9710fa47
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 11012 bytes
SHA-256: ef1c6bb275a0a65c50f6646fded6ff3c4f8b9b974c34361b9608ade7255af95d
font_02_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1