Malicious PDF — malware analysis report

Static analysis result for SHA-256 a394d7cb72be0088…

MALICIOUS

PDF

104.2 KB Created: 2021-07-06 12:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11613060bdcdfe2ffa43d5c64d2749e2 SHA-1: 0c4ae6d98e3f6b22215fd66ddb237a8d9176eb05 SHA-256: a394d7cb72be0088804e06ded53d0239b1113e93f62d1c040c854b2eaa6b7f30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://monyetmesum.com/contents//files/63829179423.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ctd8ece7vimt7pubn1oav8il6/wewax.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b896dd41ba0---11809783008.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/iter5ui4g22o8gbtpf3424fdhi/jarulovo.pdf
    • http://skncn.com/u/files/lejoponujimufeputa.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/unrogs81v343ooeovss8r9nvma/fatazifuwasagimatu.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609258339eb2e---81869223279.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0986966eb1---badowerikonupej.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rjamoclg61tvfudeomrdtrtkaa/42249831836.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7404de58938509a79276e815d0fe6722/98937392000.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/12979358656.pdf
    • https://netshopnepal.com/userfiles/file/91115640524.pdf
    • https://uleiuri.ro/userfiles/file/wotij.pdf
    • http://africa-emergence2019.com/userfiles/file/sotoferipozuxifimawit.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c124ac075a8---sukojuxugutipipunujaz.pdf
    • http://dush-kz.ru/uploads/fck/file/fukuxopamazomigojib.pdf
    • http://a-kamen.com/userfiles/file/rivenujerumolutodefezutew.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d186f4b35b---99954365711.pdf
    • http://enotecagaribaldi.it/userfiles/files/bejigizamowelini.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8f74e64017f08806992a4243ecc6285e/43425441652.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/dipumavoxuxuli.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+soul+eater+voice+actor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114a7.bin
2358a7e1c2ac4cbc2ff9eb99c2fe3c6a932714521e2e0cc61b2c361e8859bbd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 19192 bytes
font_01_sfnt_off000145ae.bin
fc543ba3d23aaa4e7fade9fe77127fad255bf82567c2db9f4f819bed5ff81583
pdf-font-stream PDF embedded font (sfnt) at offset 0x145AE 10264 bytes
font_02_sfnt_off00015cea.bin
443bf67b476028ccb52562ad62a9785819c42e5577f2c07a3bdb37d0d7a60f08
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEA 9004 bytes
font_03_sfnt_off00017b37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17B37 16792 bytes