Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e9840555ce7f19…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 09:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f1ebfa0d0ce969730edd57bbc763ff9 SHA-1: 681f53a35be55174e62853923fcea6b3c044fe4d SHA-256: 58e9840555ce7f1901ee3757ab54560b898bf8b02863db42ad2357a1a6b59ca2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous external URIs and is identified as a link farm hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content. The presence of multiple links on compromised WordPress upload storage further indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=cara+nonton+mnc+tv+di+android PDF link annotation
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9515f7770ev3k179q8sritl6p7/xasejok.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133794fdc8b4---81429615035.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/rovesutisaguxivesesabenox.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/vuguve.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/51052705251.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/taxorebolesazufoj.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/38766750399.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/tidofowutuvaj.pdfIn PDF document text
    • https://eklyps.net/images/file/26678704972.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/67801842873.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/62143391097.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/75859939477.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/11530058349.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/89136588731.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/l38qolnihpeesqrtn2psoteopm/zosanorekuzumemuwebarufu.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/zetudiralalibaja.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/nuwuzoregu.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/55782517364.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0qb5oafiqpldelq7p5tfgbuaos/4107643721.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/jowipaxaramom.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/lowibokani.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/29312951027.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/funuvudi.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_off0000bc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC69 17128 bytes
SHA-256: b89547a5d8c159280e6cc360dbf4a16407e81d605eeb7169f128c9133a45da1d
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 10280 bytes
SHA-256: 0319d9429eba9d0a014b2761865fb9fe2e2979ed928ef0a8afae37cf5c950093

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