Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d765657de7a06db…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 01:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0c75b2ee7da1478ab3b03c98fded7bf SHA-1: b30cfb4bc8f147a93d00bc2852c8bc80feeded72 SHA-256: 1d765657de7a06dbe1edde93a82948e1c03f1eda4756a891216e9db9c3c3555b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing and malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5f1f29ba---disaxuniwulotoxa.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/50973189699.pdf
    • http://kursadowicz.pl/Upload/file/78355666824.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4qfmqeevmrek04u4qde9birm56/94909611021.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/78a44316753d6a6d396e99914478eac9/72500581401.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5552fadbf040cf6ff51007e9c821fc1f/34338386051.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/576895afae6b5ecb1f8a517e0cb62ec6/podamofiponibewekixumagar.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f268419dd4---rakajoleb.pdf
    • http://cupta.org/userfiles/files/20210528063719.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0feb9731b97f6974a2720cc7b86a905b/52404599402.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50c390cfba---notemusapezideneneb.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0srab8pumceq14v8qq237u1gku/xoboxap.pdf
    • http://bafiti.com/sklep/userfiles/file/bebupiwuwexen.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c953f61e8ef70a5934f0cda922ba0b86/wupukomevironuxim.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baceeb9ade5---20794705700.pdf
    • http://broorybulldogs.com/clients/33993/File/68635392846.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b51df77bbdf7d304149fef91473a51ba/18855036337.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9fe10436fd288d86b7110201ff61c60f/19365550576.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e65ada68d42629780fa4d756d207f12/lozigigete.pdf
    • https://bursakaynak.com/userfiles/file/siribu.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786dcd2464---38705431275.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/8v6f3ligjs4b0e1sir29gv8p02/85272166054.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=decarbonisation+of+energy
    • 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_off0000e90b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16792 bytes
font_01_sfnt_off00010122.bin
6d47dcf0c796d4f954a219540fb9803164332119470a6bb519e989a2e358d83d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 10720 bytes
font_02_sfnt_off000119f3.bin
db6bbeea354d92c09b6e20d4c7c6e9ed102a21e3f6f58fb74b018f7ee2c182b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 16680 bytes