Malicious PDF — malware analysis report

Static analysis result for SHA-256 311908403f780b72…

MALICIOUS

PDF

94.4 KB Created: 2021-09-08 08:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 705fe0a94aeaeb8daf67789041a761a2 SHA-1: 3eea4fc0465bac9a0eb2e14135ea0dec1e7f9f00 SHA-256: 311908403f780b72b449fd67bb5018357db48333f5e46f5f1160198da1b8fb40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://medvor.ru/uplcv?utm_term=mg+zz+gundam+ver+ka+manual PDF link annotation
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/649782523a20f5e24f160e8cc0d85d06/nulonozox.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/gogukovadup.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc73e1165---80940248576.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/wuraxideribofixodap.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098445ccc8a6---14113374824.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/oeie83kss2ca1du0ufnuv7anl5/jigaz.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862abef3469---refubununuwemex.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ad7309c2e6e2dd33e081b6565fbb55fb/pebowarilofite.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210717014558.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8928360c3db789b129c75bb03e00f05b/xojodilapalel.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/sewufojagiritetobixuregil.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/50127551289.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160796fdd26a08---51306340209.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/db97d8d652e12a56c8fd5db3c86143fd/sonolelafezorade.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/gonotajimujezuvavinopan.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/3722519111.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/45833186275.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/rokuxemin.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/6798723825.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fadenoxagalegitamerep.pdfIn PDF document text
    • https://irrisyst.eu/files/file/nelukuvosoboduzutabulew.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd5c372a2---jisozi.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/nulabatutiwuvirekogo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b0161cd7---6748740738.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/917099111.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_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 10424 bytes
SHA-256: a96f1ca4bf549f2ffa1d09352872c10c7660d05985041f5ae444d5dc5c9c3d7a
font_02_sfnt_off000133a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A5 21080 bytes
SHA-256: d917668045abc84016ba481f39ce8bec28005fca3119b219f95cb9c76583c925

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