Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d551b1cc09833b…

MALICIOUS

PDF

76.2 KB Created: 2021-07-17 15:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7350caf80df82d709268d6e2213ef4ac SHA-1: 001b14ea91a7ae7ce5253fae3251384b48adcb4f SHA-256: f0d551b1cc09833bc857f6650e57e2a82ff1b3fdc9a7021c1b158703f30e5a28
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977e4f2add2---repitidem.pdf In PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6gbe555o8vkl2b385t170eqvnt/zozetatajinabaketuno.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/jumoxiputida.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/48252311402.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ef61f053f---90939650806.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b0c0f52df41ab295886b54cf9559d890/38104330692.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609156320db42---45334090551.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da34e69c8ec---bujiku.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/46334dc5db9615d5ac4e6394489692d6/89808160887.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/fevivijawavidigodifep.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d93fcc326356eac8a15643f121f03cb5/55591258479.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/zifemutaverikazob.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/fawebexizatuwu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9923db278f---xebevazujopaxikimuleda.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6c653cd8---26436530691.pdfIn PDF document text
    • http://headrepublic.pl/images/files/lilidazitumosat.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210604_AC018D1D53469B30.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/laxawekaf.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/difexasafoja.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c620618ebed---56494109941.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/93551517833.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/dc6f161cff2439ef4d53241df6501007/75288620541.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/bemivalulesuvimoj.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/watapowubevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=semiconductor+physics+and+devices+4th+edition+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 11404 bytes
SHA-256: f34e6fb1408e7e52bb5b5242a980e3419d2b2b14c4804ca7a428c069e2c1a7ac
font_02_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 16916 bytes
SHA-256: 164509e4e0185070e3d3a16bf340d3091cefdd6b2a24b6c461f2b12309b26015