Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7a3ce8ae9f2707…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 06:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55f576bf833d4b9a27b15cd2f8ba8198 SHA-1: 96c4d3330895b294a16ddb537da6f605300a8397 SHA-256: bf7a3ce8ae9f2707f5c84a84d5b358e6983d2607d14ffb8e87593123dff2d423
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan characteristics. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users to malicious content. The presence of external URI links and link farm indicators strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=pdf+contoh+proposal+skripsi+manajemen+sdm PDF link annotation
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4f55t087he1bda8s6nivk9dlm3/70219731961.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8q229sjd3ul19s46f1jgbj4suj/18054402157.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/jolos.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766d5befe26---sopabajug.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/vebexefeduv.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/rapasug.pdfIn PDF document text
    • http://mqskin.com/luutru/files/gaxuvanaz.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16121d98e279ec---26410327168.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/89a6b27e514183bf4052d58de2463d1f/44945255477.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202108310810579017.pdfIn PDF document text
    • https://buka.ru/sadm_files/jesowududaxoxivulamew.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/liwumun.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/26854984405.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i45qmq7g9rp3ddq3misb6g9kf5/83771818725.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d936b2b3d9---69929801040.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/76014725364.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/81339632.pdfIn PDF document text
    • https://qnzar.com/files/48861810536.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00b6985fc---63043347195.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf1420101---mowutumukelev.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f986355b3cc---43911312082.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/42474776491.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gemagumaviferu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/38266933756.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 11108 bytes
SHA-256: a59f7c45f2cf44b0a2f7069da221d30122718b4cce7bf8108d9d4e636a038f99
font_02_sfnt_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 17688 bytes
SHA-256: cf7655761a6bbb7ea4d0f77a96c0ff393e1f6493b79cdb9f280a6c52551e633d