Malicious PDF — malware analysis report

Static analysis result for SHA-256 75705d3acc363309…

MALICIOUS

PDF

85.2 KB Created: 2021-07-08 09:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea993a9b10126df52053a0d444f86655 SHA-1: aa1d617d9153c3a23475f215cd998203baccbb3d SHA-256: 75705d3acc363309c84534eb9b26f772ca9cf023315a31e360394e253b6c11ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ketchas.ru/uplcv?utm_term=put+you+out+meaning PDF link annotation
    • http://fenotropil.ru/userfiles/file/rifaw.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/netebilo.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/fejewozidapiku.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/jozerisiwixifadik.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/wopowap.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/29847013931.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/0314cd296403a8600b6cc13caa572ca0/11985735968.pdfIn PDF document text
    • https://activepymes.com/pub/file/11145243122.pdfIn PDF document text
    • http://dhf-china.com/d/files/78784429468.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nhpa69a9bot7c5u0apfe273krq/42993394356.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72208361b---45730087893.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nawafixewivusedejirup.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/wajojelal.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/75cce6f1c59533a28c8ba4497c5cced9/tirigutavalu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/94e22c35bf9a8657f4442e6168e09a4f/tutorod.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a191e1d2f4---58021891862.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/85472180813.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3bcdc5ecb---tatumogujop.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5cfaced7---kironibavulafiwu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607258034e292---81511468812.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a42a13185782f96dabeb3bf701515bea/6272558673.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8ef3fb1a---pojupenigakevalalef.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_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 16420 bytes
SHA-256: e4fa28b6f22682493703d8321c53cfc0ef6214963d2ffb99ece05318ffc8f5d1
font_01_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 10352 bytes
SHA-256: 66afb6f383d029224a181afbbe45872598db1325146102579ab7ef2638a025dc

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