Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aea1d8d8a5f293…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 10:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3560aa5ef7d76368351a4e9626cfd4f2 SHA-1: afdc03fa515d13d2f818a0c6d316d3eb09f606f0 SHA-256: a5aea1d8d8a5f2934d5ebe797aaf7925f18621cb55d66d8affd6a328a958bd68
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document with a clickable action, designed to resemble a legitimate file but instead directs users to external URLs. These URLs are hosted on compromised CMS uploads and disposable domains, suggesting an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=computer+security+literacy+pdf+free+download PDF link annotation
    • https://speakingparrot.com/upload/ckfinder/files/zojefuf.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/11195611183.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210706092320_4sknzp.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/81328902765.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/fogan.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/mijutazisejuxo.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/53554ed8f5af345b40f543d6cf225772/berutopenimimikilar.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/97b6b0998797b6d3b0cf17965733fef7/momodujakemanelinufujen.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6f149ce09d92766a3c63f7a5b6a8350/sumuperiz.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/xusiberifepifiwo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4228a57202---35074959156.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0ef2cd91---kubusero.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/3651328137.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fda99302cc5ca670106faec2e340ddc7/95809777683.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/16520255605.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21ebcb491---27563993487.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/e8v56ugds1tb5aqmp1o5t57p89/vuzoradu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073717c70910---83477409290.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9cb029b45---56792348407.pdfIn PDF document text
    • https://fptica.ru/images/file/75246186996.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/pilawa.pdfIn PDF document text
    • https://soechi.id/userfiles/file/8435954503.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bf949cc5c---zaworebigexutipulujo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/rawuvapesemow.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613399ba0b54c---rosunajilaxalorozinoru.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/5021510712.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_off0000b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 11112 bytes
SHA-256: 2f3dddc2a1c6559ad4f5c97353c44746b89cc7ed25b3501f488aa4e19659f344
font_02_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 14452 bytes
SHA-256: 6347c7c957e07a5bdcf67a8518312fd685931a299c75e54dc42d2379243bceff