Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a0e1729f3acf06…

MALICIOUS

PDF

108.1 KB Created: 2021-08-01 20:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7750018efcfb8d48f625a3d9175b3883 SHA-1: 0b4f7eab8fd66c42e1361d46535ac3da43fada5b SHA-256: f6a0e1729f3acf062a59bf4a243dcfbf27211aea4bf43034ae404a62039c5abd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://whatdwellswithin.com/file/96425420780.pdf In PDF document text
    • http://acm-medicali.it/userfiles/files/68789777333.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/51523669630.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3751591d4d7ba4da2e7b7fa4f7b10d55/pijile.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/lefodav.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/fifemubebojeliwurexa.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f05f71d73---77162882966.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/xutuz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c174c60cd---nusenef.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/41470268031.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9a8a63313---kofinodenazexofazejan.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05bf9cf04a---tagoraxa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608284f379a86---zaragejeroxezamof.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/66696803739.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/43028379164.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/76505580070.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/21651274026.pdfIn PDF document text
    • http://4bx.pl/public/file/51201683878.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/53782228902.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c386b6b57ef50042ceadf89aef09552e/10571454790.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/duwijixuwus.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/wurukupoma.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/gugenipikopenedazuxol.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/jesioaq3qm8mfpe587rd4na78l/54979313410.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcfd24bb1---lazuwipegefazijiragizu.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/fovozeledexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+much+does+a+great+value+ziploc+bag+weighPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9A 11300 bytes
SHA-256: ed4192edab7d4794836e1f028f978a1b9c5e385b32cc3a7e3e12434674a2742f
font_01_sfnt_off000159cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CB 18284 bytes
SHA-256: aad7a61e69d093d652237f57b4b5b12b5fc6a8cca0a18f94b0073317c7de85ed
font_02_sfnt_off00018a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1