Malicious PDF — malware analysis report

Static analysis result for SHA-256 445ef94219dd172f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 18:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c89ad75fb8539f8753a222112a4643af SHA-1: 2cbfdf19bf06464bfc640c869e397f9b62d18368 SHA-256: 445ef94219dd172fbb5f557f7cc151566c1e8f95437fa735cf2a4614c037a54d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised domains or disposable hosting. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://otoform.com/upload/ckfinder/files/vogefisobajuwobut.pdf
    • http://thermcom.cz/userfiles/file/27467015945.pdf
    • https://10s317.com/uploads/files/202109012348428822.pdf
    • http://hmondo.com/userData/board/file/nalumonufifin.pdf
    • http://gmicropilotes.com/uploads/files/40711041046.pdf
    • http://monarchiaerembolt.hu/tmp/23739803956.pdf
    • http://jevades.com/aircraft/fckimages/file/57145897898.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6f2fc77b2e2506e2446c79f0e49b397d/vazure.pdf
    • http://boxethai38.com/upload/file/fovodapaxujusidekesute.pdf
    • http://didula.com/img/file/42677049555.pdf
    • http://hypotekaprezamestnancov.sk/res/file/21579908810.pdf
    • http://geomanteia.com/userfiles/files/timesobuvegunak.pdf
    • https://dveropolis.ru/upload_picture/midonosi.pdf
    • https://hw-power.com/uploads/ckfiles/files/61379cec9108f.pdf
    • https://smartbrand.ro/mm/file/4382898086.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b7dceb8862f0464cf9d8ce3c79f939c2/91236259755.pdf
    • http://balone.net/_upload/file///29380859348.pdf
    • http://aarogyamedico.com/userfiles/file/xisipebigerivatanavad.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3f5898f0f74dbcb6be5e924d777c8187/rekobisepubufi.pdf
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/27948894816.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e478759682b2ce84e7912754b583276f/53717030899.pdf
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/fovotimiwax.pdf
    • http://eko-inwest.eu/upload/file/72265206684.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1ffe32f0bf85094d661c6e5f07b58c08/42268870094.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=notification+not+showing+android+studio
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dead.bin
561b52a557962b8891c1d4f93b0659f699950cc4fe637bbea7748ce2b96162f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 10740 bytes
font_01_sfnt_off0000f733.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
font_02_sfnt_off00010f45.bin
c4e3b72ff2f75070148f2a7326cfffd36fc1f25873ae01e32c0df599459aa3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 18644 bytes