Malicious PDF — malware analysis report

Static analysis result for SHA-256 27da1887cbb28c42…

MALICIOUS

PDF

71.8 KB Created: 2021-09-04 05:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 847ba9aa3d5d932dde308f039f5f425a SHA-1: 0fc33c1aa717486143484cf7f8a93152dbd4f43a SHA-256: 27da1887cbb28c4296ca1d6a55fef7dcc57bc570859f8f56524cb166580c5eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely to lure users into downloading further malicious content or revealing sensitive information. No scripts were extracted, but the PDF structure and numerous external links suggest a phishing or drive-by download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://bayanairag.com/uploads/userfiles/files/tomomebabi.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f2f60051e4174b7c942a3932fb907d8d/pogixaxolot.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/gedugumukoxudab.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/53720045994.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/90d3aacb95b655346e8de45742787409/bakujogopejajurope.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/rurogovun.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/80047878730.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612b57d721d25---dovuxoweketuxegomu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf3ae659b---51532212353.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16116f0d441fbc---48013112042.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/38704850095.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81ba3eebdb---witixazufawilapebu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3f7a82f83fea5ae4eb45d4fd625e23cb/60454357346.pdfIn PDF document text
    • https://rotitelor.com/contents//files/nopeke.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/fexodovi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b025f7c171---dosimeludanebi.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/51129235202.pdfIn PDF document text
    • https://actorconseil.com/files/file/bomer.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/83635842851.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/91c90da6785bf4c2233a4279eb39fa41/fasoditawiwowefoxibawa.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lkejtmp19miv66sbgdge28g6hu/pitaniz.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/db254a5d4798240a8e41b5ea3aca3918/xigoworevesinaxojejod.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/2446629104.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b8ef6ffd0d6d3879b52965985687d17c/16881879789.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ac9d094b---33696938323.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/bigekigoxewunemabaxim.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/uvtm6eoeb2v2b537e30ck24hq5/21817923340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hepatitis+short+notes+pdfPDF 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_off0000bd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD00 10540 bytes
SHA-256: 50c39ca0ad004d8e4190904df74a7f11cb7dabedf82381dfa1cc0220a2afcafb
font_01_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 14560 bytes
SHA-256: d656ea8f47844f10018052028ed1f6f9ff9b9982294f06193eef063fca2382dd
font_02_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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