Malicious PDF — malware analysis report

Static analysis result for SHA-256 3978c85c843c6ce4…

MALICIOUS

PDF

144.4 KB Created: 2021-06-11 03:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0b34612a111622e164872289d079dd22 SHA-1: dcd9798dbfc354dfcb7de79ea00622ecd6063c43 SHA-256: 3978c85c843c6ce4316bd85472144501cd1a5bdcfab4109a8bc9d44a847c27b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://irlanc.ru/uplcv?utm_term=dua+qunoot+arabic+text+pdf PDF link annotation
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/n1su3q4gmvn281alktheeiarhv/vuwukozuxepatarotusorerix.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/315c13a237fb9e34f7241c9fc6e59067/witulebuderisowix.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/hv6lrvvg8ej9jqck45rp75est4/51640688377.pdfIn PDF document text
    • http://geose.ru/userfiles/file/96430550523.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0d1f78477d4be502add70aed0104c7e6/selonotopuvelumowo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e0605882---28909324814.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mutidikobaxiz.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/niwetejevodiponok.pdfIn PDF document text
    • http://apvn.info/userfiles/file/27331192609.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/78583892052.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/16916d6d543240a779c6d9745cb499aa/22948207828.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde3ceccc0---23745197829.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/934b466ef5e1ac0a9b8948e8f6f1e973/xivexofem.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cea4f8f295bc03412a266bd2b0ecdee8/xomimi.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_9DC91111E7C10A7C.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607612ad09e96---32554498637.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/f6f638d29b003b50e4dc0a0e91bea9d1/30114868237.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001f13b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F13B 33064 bytes
SHA-256: 3532d9bc02393ff566acc40c4f401be8d4d6beb13d03bd6151eaa2db5149bd3c
font_00_sfnt_off0001b8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8DE 5156 bytes
SHA-256: 4c8bdd880b39ad734c7001af155a41f3a3aa653f6e0fb72fd51254ff11994f5e
font_01_sfnt_off0001ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA6E 11452 bytes
SHA-256: 2e6f5bcdab31aea071782f051ffe393e9b868511bf8e2b5e1a15200e1995a9a4
font_03_sfnt_off00022abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22ABD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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