Malicious PDF — malware analysis report

Static analysis result for SHA-256 f497a67dc3f5b0f7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 18:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a77b3bb6fa0f87a0c2e2f26b611e6427 SHA-1: 0124fa86346e440011909b182ae3d9e85879a199 SHA-256: f497a67dc3f5b0f75c3b9f037a3c3165a35f75a4dde44b62bf76ac0fe866a526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=bubble+shooter+game+apk+download PDF link annotation
    • http://liderzy.natura2000.pl/imgturysta/files/80281464704.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/17995887574.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/74896318933.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/waduxe.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/59275603353.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/81308699966.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/kexoja.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/42266922902.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/16580066953.pdfIn PDF document text
    • https://titishop.co/upload/files/kawezerunuzup.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/4k9458upn4hr9tovovibvag7n6/54650084589.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/61984348261.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149635d8efd1---zaral.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/bojewa.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/22397807497.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/8288307569.pdfIn PDF document text
    • http://attlas.center/userfiles/file/baluvejivikuvaxuguwoju.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/35255888585.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/mimuvegurowolatobubojo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/241ca1f9f7fab45fb30ceff322eacd94/tapitixazuxatafiradaka.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/47114161596.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/ridapolujumik.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/loxukatimonexe.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/fexatifokafipusemebe.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/togolumozuzej.pdfIn PDF document text
    • https://alev.az/userfiles/file/68760279976.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/luwurewavizabajakugita.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_off0000b2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DD 14392 bytes
SHA-256: f84fa782308f8e4a62a399a3a52200b742ad76404da558d168789e4582139a3d
font_01_sfnt_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 11220 bytes
SHA-256: a5173325137293b18b5fb24a42220a545684b1e9153215be746fb31afed3bf51