Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78251d26c8eb975…

MALICIOUS

PDF

103.6 KB Created: 2021-06-09 15:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 52ef0de23a6fe6b6200f013f07229314 SHA-1: 441c0e2bd645d40e54260c0900b41938653f6674 SHA-256: c78251d26c8eb97536bd148caae1dfcd8b0050f74a0fc735e1cacb48b7c9a137
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/uplcv?utm_term=list+of+gospel+songs+lyrics PDF link annotation
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a33563ae6b6---92948013066.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/68208288105.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/de1b0175305bb3e0eff6259dab050395/26410761628.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cecdac3e0---foxetitelonujasulomumig.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37a9b159c---43284959929.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810033c8bc4---43113179032.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/vilezeza.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jalapigovupasefuwewog.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/relugafe.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2o3ocuouu8uitah8vpmicgt3q/rilumofubokewajudepofudan.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b33cc95d4fa.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/44318629908.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3dca7b689---76342724794.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63be290ca0---rukimoz.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/06603ho3e5qapjbffgict08q34/namavovubebe.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d0b02da6---2473060744.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/88734648018.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/xevokevorukalemume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14385 5952 bytes
SHA-256: 5578b9b9bc30a8690400daf2c771f94ad57eda8220010cff916a8ac58c220e30
font_01_sfnt_off000157f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F2 5016 bytes
SHA-256: 9072f2973cdf178f25b696a99b284478236b82db6000a7f20de5af00d36c00b1
font_02_sfnt_off0001692d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692D 12236 bytes
SHA-256: 608fe3c414741fb26447a93b8e7358092ebfde2c609b79558fc69685ed730703