Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a34c6c227aca8b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 00:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 393a7e3707a63654e88547064f87ea76 SHA-1: b5c9471e0907cedf8e329a0d6d8709c065d5219e SHA-256: a3a34c6c227aca8b8555d9a1be82cf6da9c477f3f251b267ac92305169b4be5e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute malicious links through search engine optimization.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wsp.pl/userfiles/file/73613914195.pdf In PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/12930337222.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/retowekofizamuwifef.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a9fd19e7---tagofaxetizuputevobagak.pdfIn PDF document text
    • https://jensbrode.de/files/file/gimatuxiwad.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/99863328176.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/vorarepozodipixa.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/25422947283.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/30004209374.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/vadapekixa.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/fajiribagitusaje.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/26541310939.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/52858721924.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/borukuvikobejekerawopami.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/9898968408.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161398376e10ca---12177114658.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/174c96a3ce72236ccf85a7ce92366e0a/61512696219.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/577a107a31b3ea052964e5f36aa034a7/kuwolodigu.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/87694450766.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/pugenu.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/nisupinoxiwanupoxufefipu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e39bd75a57a34b848e88096873c4deaf/10715155428.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/nenufuzenodibuba.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/gawinulurafelalusutek.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/92119584621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+automatic+clicker+apkPDF 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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 10788 bytes
SHA-256: b4c32c19d16c3c995c7dd95505685a1eaeaa8121c83a54d7b0bc6bf9f977a3c9
font_02_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 15768 bytes
SHA-256: fd4b5c11efb9ad7d9e4bee9eaff15305ab7d3714ec876566e08ed6a9f6475bb3

Open this report in the interactive analyzer, or submit your own file for analysis.