Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9622044cad12c2…

MALICIOUS

PDF

111.1 KB Created: 2021-06-29 14:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9a16daa3dca8420e8a76bb2120a6a7b3 SHA-1: c72e3f60c9cb8e138b0b9ec699e79f2ace3b6457 SHA-256: 0c9622044cad12c2b097315e93f14d84a5a759049aaada1736c6eb60c274c736
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://apexibd.com/uploads/fck_uploads/file/luxilunurokuxeka.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160743f504c66b---punasoz.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5oeq3l3v0ogg0i9k14uhp5ia2t/garij.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff26367cd---59780701892.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/oo7unmskrat5mrh5hbegtra3n1/89253268245.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/27803626701.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9adf12471---84841473495.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/82073420115.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fu7endlefdfe9egm2ckg0a7hpv/rewokerozapimebedem.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160a8496c32026---42574054236.pdfIn PDF document text
    • https://stopserv.ru/files/file/suvamidexenoto.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/gozixoputekufokigulisip.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b733b2b08---55808456763.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607779686483f---67023247524.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/2912325660.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/48948867740.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/nubaledodofa.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f4503a56a---jitumigetinozebilujogi.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/sb35g4lcm6ln8tm58llcktlg9g/kezeleniweziwixete.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/1950824555.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2589c4ad7---xiturenukemes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+trainer+toothlessPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15103 17956 bytes
SHA-256: ec33b3fcef5cd66ec3f3dfe9bb54d74558ac0989454bbf3eb8f3511b31882052
font_01_sfnt_off00017fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000197c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C3 10388 bytes
SHA-256: 39b2d669ed992eb51b3212597a605fc1aae0fdde59c07038d8b7a9717fda33f5

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