Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca45f0305de6707…

MALICIOUS

PDF

83.1 KB Created: 2021-07-16 06:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b6f8659ac569afdc0bee653201e4d64 SHA-1: bbacf18ed9653f321806e3f8c0f3a2bf8d6b0ab4 SHA-256: aca45f0305de67074f47b2421e6f18f6be91c7369ab83df2597407c04af8e408
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 and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and a link farm indicates a likely phishing or malware distribution vector.

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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/jp1f81s0pemrbcuqpev9e15nat/sevumojomupubexolesi.pdf
    • http://duhochmis.com/files/uploaded/files/39670752869.pdf
    • https://247christianity.org/fckeditor/userfiles/file/456872774881624669077.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc0045a29b---79174945159.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/dfb0dc446373b4b149df5e219ef30fc7/67995199828.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5167b7484750e442d25766135ba1553d/lepewag.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/26587644524.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b9cd6a805---gusotiki.pdf
    • https://yarpaket.ru/userfiles/file/gotafoxaguxukimazazo.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j5jl3q6h6m1mct05piuek3f595/99415437278.pdf
    • http://derma-dts.de/files/file/84742386286.pdf
    • http://ashioke.com/images/library/File/50955484827.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d9b2275a6846914e1fff2974339146e5/16506145435.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608875303abaf---89705546903.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c972f72b10---20927087737.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/pivovevidepikip.pdf
    • https://shen-su.eu/gfx/userfiles/files/81478402742.pdf
    • http://debnine.net/UserFiles/File/71875513489.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1q9h3g6fs279ob0ttp25pif2ib/15167539175.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/44667050346.pdf
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/75774389598.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+remove+auto+loan+charge+off
    • 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_off0000e35d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 16792 bytes
font_01_sfnt_off0000fb6f.bin
4623059fbd050730f2af387b6e9490d7541df4271c2f1488da270846bf2fc723
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 16684 bytes
font_02_sfnt_off000126c7.bin
e579eeb06cb74f633a124232566040a5b910a340bf324a75525442523cb4cf1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 10768 bytes