Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d19f914ae059ee4…

MALICIOUS

PDF

92.3 KB Created: 2021-09-04 17:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac8bdb88e3a0516edd6bca71186ece7b SHA-1: 34d8d9c4f7476bb1e5c3ea69a26670eb3747a056 SHA-256: 3d19f914ae059ee4554358ce6624a3cece8e0388a9b0407d3d8ce4bbaf2a740c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or initiating phishing attacks. Multiple heuristics indicate the presence of link farms pointing to compromised websites and potentially malicious content, strongly suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=cifras+gospel+pdf+download PDF link annotation
    • https://sistemagestiondpr.com/userfiles/file/91178689094.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/digokajolagumizajiw.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b1bbc5b0a---fakivuludesor.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/kuwovileman.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/27ht8etm5ur02feqhnd1sorrgi/somupu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b2df1ed1c7553c4f2e738900b0bf521a/barodadumonexuzifafad.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/31972250820.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f415377f---64450861739.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/62f137f38a467a4fa81abe7c38feab7f/vubuvovujagoluvil.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/sunezegodukuxadebe.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/28659205250.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/aip1tcana6pmm6f847v5vgilef/judutapetutexabevoviwo.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/60901229137.pdfIn PDF document text
    • http://ezibra.pl/upload//file/72112758394.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/raxilonubolaj.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/dodidaxozeg.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/14798436763.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea5132b44---nezowanirunenuvizu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc22bda1002---92904330542.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/02375g44tsmjcqhon8ns3keoh8/96700157262.pdfIn PDF document text
    • http://ty-int.com/files/files/23957171621.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjhj63h3pqh9d5m0h16fn2iqrh/26520074974.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/7p5v43mqa9t0vg48r6j51qvsud/pozejeludagabixu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/31310490567.pdfIn PDF document text
    • https://paperland.bg/uploads/file/90935291562.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/dle4q85201guarvsm4ibi2pbd5/53904182024.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/sapabid.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_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10692 bytes
SHA-256: 619c061642cd6786ab83671d9e888a25371814a96ff57f3521e299afc3caf468
font_01_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 20016 bytes
SHA-256: b8e8dc4bc78f28e1319e7c62c4ecf0a9cbb33e13bc86edbb364f30c28a434089
font_02_sfnt_off00014aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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