Malicious PDF — malware analysis report

Static analysis result for SHA-256 5054ac4d976137d6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 12:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3da3fb0712b6a2dba1cc95e9e48a0a17 SHA-1: f1b7665a9b79cfd1564186fb8dfb54a26845bd40 SHA-256: 5054ac4d976137d60e8040043372fae2b61ecaf36d69d6b969a15b23749b7f57
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. The document body, though heavily obfuscated, contains embedded URLs and the heuristics indicate it is a link farm and a callback phishing lure. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings suggests the document is designed to redirect users to malicious sites, likely to facilitate further exploitation or phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chorland-dining.com/webroot/editor-uploads/files/44549490726.pdf In PDF document text
    • http://kryotherapie.net/neu/userfiles/file/dirogabuxolajim.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/gukaxoresibexogu.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/94385349293.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdce527ffb---99825701131.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/41151092205.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/6619103979.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/rasiwo.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/68948833535.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/volixitetopunoxidukopa.pdfIn PDF document text
    • http://rooptex.com/uploads/12746247307.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/fakexogufadok.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402beee64a7---ninomofasidawakutewaxeper.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/37278380845.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/95662816220.pdfIn PDF document text
    • http://ultrarelaxedcbd.com/newerac2c/userfiles/file/mekunuvibikozawib.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/54419273152.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/23907868586.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/95079110416.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/57f79d9468b572e72d30df834dbb6de2/madas.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/24129042260.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/fatodetalunobiwaxog.pdfIn PDF document text
    • https://red-adlay.com/upload/files/11020720750.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/detufurowak.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/nubawedugutawetajiku.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/magibapejuvaxaj.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/2217139068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=taking+screenshot+in+android+11PDF 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_off0000b535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB535 10708 bytes
SHA-256: b00f71de997665d4266f91c0e1aab0e38568064090bb1a48e706f1e92cbec9f2
font_01_sfnt_off0000cda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 15816 bytes
SHA-256: c8ddf9f6aeb3d3c42065c350181e7ecc368dcb94f5a40896520593206de30bcd
font_02_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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