Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80020fdd2a2578f…

MALICIOUS

PDF

102.0 KB Created: 2021-06-30 19:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ead3572a01f7085ef2a6020ce593fefa SHA-1: c00d68fc7a0802eb4d1307caaf3ef60066086961 SHA-256: a80020fdd2a2578fa503eabd96163560147f2180001af1f01c47bf79f6c53954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rsrl3kgq2o87nd433dsj2h6up6/46533869410.pdf In PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/44919966584.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9a3af2b2eab185638e9c51fa50038af2/vibefoxujeminamomepudexez.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba9b564e53---17971764740.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/87159347188.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/radetu.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/vemasof.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d245c94bdd28974c4f13fc4933153378/76380063705.pdfIn PDF document text
    • http://secretinvitation.net/images/files/kowuk.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/90236630440.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16242438155379.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/86a79818abe11ebfca94018ed55359a1/12889112170.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8730c397865dca6104efae497b64409e/20292553537.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c8bc761075feee69f65774ea42475412/68156189438.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073762bb4ba1---tugal.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8789acf27---julidazarigunirixi.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/jelakiwafejag.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856ed6314fd---fogikipux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=answer+any+five+of+the+following+questionsPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 2304 bytes
SHA-256: a97b912ee8ee43981bbd1bd7576f831b4c4380bd92265e31cc2813a2ae8269c0
font_01_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 10988 bytes
SHA-256: 52e152269ffd539aa95f5ddd3029bd1b6d8931845687866bb2ad314e4b78a296
font_02_sfnt_off00013f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6D 18788 bytes
SHA-256: c52934198725fd3c26fcfdd5a7bc56667066d673d30093be52c81f189cbefa2e
font_03_sfnt_off000170c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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