Malicious PDF — malware analysis report

Static analysis result for SHA-256 b401a67859b49433…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 13:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df9556b81aa45a36f4550be4ecbebc27 SHA-1: 689d26a533069fad3f5ceb3859965e2e05337c43 SHA-256: b401a67859b49433b4b15961ded3ecf478a4ad7793750f58962342cc2e0f9987
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links are likely intended to lure users to malicious sites, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://irlanc.ru/uplcv?utm_term=pineal+gland+and+your+third+eye+pdf PDF link annotation
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/15948825606.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/zidajumotolanoni.pdfIn PDF document text
    • https://superpart.com/files/19480162286.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/47455860851.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/dipeleju.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/zasivuxupat.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/vafugafumuxakamozewaxu.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/52810169998.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rukirazipiwitupebefobubul.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d812b23c124---27174515082.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/mopur.pdfIn PDF document text
    • http://espicycooking.com/files/file///81794614905.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b00bf11b155---76158542481.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/10483564617.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/sn324htc2krilsodo4kgb31upr/83896563339.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/21ee8be0ef8ceba6e72c8aad849ecc03/29028700392.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/19779073257.pdfIn PDF document text
    • http://thedreams.cz/files/dodirotejuxegizovu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/fojevuxexanaxoga.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/81449886218.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/30485208341.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91877044767.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/30285536157.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

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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 18256 bytes
SHA-256: 9512a0f7d6f009f517a6346ed8ba93a8242b9c5b1f20aa76df8218000889e608
font_02_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 10824 bytes
SHA-256: b47ccea1689ea7618fbb89af6606a2f31fcbbd892f444feea180bdfed77b561e

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