Malicious PDF — malware analysis report

Static analysis result for SHA-256 71958b5876630158…

MALICIOUS

PDF

86.5 KB Created: 2021-08-15 01:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9e518e4a72abedfbe1a4130f7ffee5e SHA-1: de2354a976ab089d27f1a18595c8f71fe1530823 SHA-256: 71958b587663015832af9cbb20b64f065c86c8a799db573f97c0f988fd9e2137
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://rioairporttransfer.com/ckfinder/userfiles/files/49244978487.pdf In PDF document text
    • http://skene.es/userfiles/file/bufefipitumetipig.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/4562687231.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/fapotamij.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68cc3d52d---63685196200.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/13673494825.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fea53d5483b152984ee8305b22049e04/38594273883.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/10645762832.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/fosulamisepum.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/rabodubi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767905c1f75---dipugiteropigafu.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/nafuvidusifi.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/40093114557.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c24050f945dff39475205a256fc912ae/32094045244.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078734131847---87217080885.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/55306178824.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46639247519.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/wugabaxusazup.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/50637794238.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4279391c69ef70dbbf730304c3869651/53922999431.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/suwaligiw.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/bfd8d42f0ba66559d1069b4ee47a7cf5/fijaxibotozufatevupibawa.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/64c2bad80d4923c2656a072ffa9bd1b7/73156741913.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/68672806433.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160776e5cdeb4d---kifisusisev.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/vebemekunovofakejokixu.pdfIn PDF document text
    • http://soles2walk.cz/data/file/52774453936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+presente+perfecto+y+pasado+simple+inglesPDF 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_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 11192 bytes
SHA-256: 4a5c22df08553894ab8cb8917376de175960b4ca5553c8925d6f2476c0885926
font_01_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 18008 bytes
SHA-256: b2bc74c922416857e6ed43d0896939a49ae6a7c30c9ca7b3b4302c90fb8b54e3
font_02_sfnt_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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