Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac2827f4f4867d7…

MALICIOUS

PDF

89.0 KB Created: 2021-08-11 12:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b6adf924063e0b90b43912d29a0a892 SHA-1: 5c83897f9a51d711f7628d0f9005e4f3f41fe6c8 SHA-256: 8ac2827f4f4867d7a9d7a0b3301a4300a43ff94c3d9e8aeb2732f061b938dac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection 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 heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=what+is+maggie+and+milly+and+molly+and+may+about
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a63416370---jivuwegetenunokuxoxebekid.pdf
    • http://jaatkinson.com/userimages/50794527071.pdf
    • http://bright-inter.com/file_media/file_image/file/80594774606.pdf
    • http://auldskoolrocks.com/clients/878384/File/tivasifegesa.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607701b940f19---25747077943.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/ab33bcc63fa73d546f9c6651e1af768b/48132032339.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9715e52e77b258e53e06526ab1a2d64c/xujojukanu.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc7b7ce99---betuxidaban.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d74707a5089ecf4c82dc28e3aaea8f40/dabinagex.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fezetoja.pdf
    • http://qzgj.cn/upload/file/xawabolologitepisagujiwef.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/81299218736.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/jirukiji.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cff9ca6b510---24011343737.pdf
    • https://acrgroup.nl/userfiles/file/93077801175.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/855dvglhk5vcikqel8l9gfj304/biguwosamaxaginodawanew.pdf
    • http://dhf-china.com/d/files/9802906991.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/14bfee65ec750423517206d53e582074/93822718347.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6ced368581ca9f96411768c7bd408404/19107737095.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081230386edc---29896638551.pdf
    • http://preciz.com/uploads/wysiwyg/files/72831081132.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/660572eb88870491f226e79b584ac9f4/39053706278.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/06fdcf9197f6a790378f471f721b6076/8789462744.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773662b4aaa---litujusanovemokipaxuwowin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f679.bin
709f88f759b2c25c881dfdb1e60036b7e99392d051e414b3368df7f3d5c119c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 17420 bytes
font_01_sfnt_off0001238e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 16792 bytes
font_02_sfnt_off00013ba5.bin
60c7cc6a878199b22f7c5a66560a96fb2d1e2be8881f47502a7df31b82277f12
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA5 10944 bytes