Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3223a28afd32b7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 12:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b246de64f9c18d8a16ad8bdd187e1d55 SHA-1: 4471a98f7db41bdd9515e006b007029b403426e7 SHA-256: 3b3223a28afd32b7ce3e6f436a96386fcf66a8ffee9d8028442aa39c99028a05
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The primary purpose appears to be directing users to external malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=negeri+para+bedebah+pdf PDF link annotation
    • https://virker-ikke.dk/files/66373840982.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/79887012243.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0e3d457c---66636012613.pdfIn PDF document text
    • http://myqself.com/upload/files/wojugunozozewena.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4031738a---62772307483.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749df50843c---sejaloditebabeluwudiwoke.pdfIn PDF document text
    • http://capital96.com/userfiles/file/tunuwag.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/nolej.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e75be9e91a51e1f74ad44abb95289632/56427293017.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/xebipupu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949052a859f---27345747775.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bb2d40d4ada5759acc720106e40d4571/623721304.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/52533605187.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/64205433661.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a75dfe2db34267fb864ac947f7752a56/18154880823.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16113bd9007931---78630179364.pdfIn PDF document text
    • http://dentherapia.hu/files/file/71808422468.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/84980373919.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/89102974274.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160870a5a490b9---pupadonimalifefaworexik.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4f48278aba15f63c3f48b7adb5ad8d8d/jogokewupovawifig.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab629ca6053---43468092180.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/abfc580555d885ae1e96fd4d75061fb1/14499916268.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 10356 bytes
SHA-256: 14e152d82d9b4e061d3c8a6b4a0d01c269551306d78ac0715333873432e7fe40
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 18588 bytes
SHA-256: 7e537e5160670791db7b01f754b6228ab596e7f36414ed45c12bc3ee0584e977
font_02_sfnt_off00012a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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