Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad5b1e0d7f435dd…

MALICIOUS

PDF

91.3 KB Created: 2021-07-27 13:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac86dbc5b7b80d88acc179f15221f871 SHA-1: d8da571499de2f5e5c299697c6dbec7e8b22b269 SHA-256: bad5b1e0d7f435dd53db8a2d00c3c682b231974a65b94c45551f4d2a81cca447
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external websites hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tranhtreo.com/images/ckeditor/files/vikubelanuvapalab.pdf In PDF document text
    • http://kajsanordstrom.com/userfiles/files/44670986333.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/icsc89312q21bua4psmk62v306/18922483084.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/95376528233.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096515bd9574---linudenupuregariretetifa.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e86f0f84c---navinisuluvorulepajezus.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070829921bb5---61129446616.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/45014579394.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/16840770909.pdfIn PDF document text
    • https://airshow-bg.com/file/16163396708.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/7fskkru283k4fgi6jjcc6mvogb/betenizoranewe.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/930b8c133b2ef727413eca7f018c5fbd/fekulojusenitawunifosulod.pdfIn PDF document text
    • http://isvpro.com/custom/files/nanixijufapetez.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4a518dbae41b3bb271f75ef1df61a763/12120685524.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/wedolaxisugajipaliber.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd96339d79---rizirukaxufaru.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607307946d79f---73333331798.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1fa3tp1dntea23t4dmmp1un97q/94915348096.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091155631ee1---varugafi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf7ada27e---sukokuvit.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/aed7e2f750e9c5e10eed194da275d635/35547738969.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/949618ab3e4bd11fc7cd4337b763b5c8/gukorizuxovekonolidiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+set+up+ring+video+doorbell+proPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 10788 bytes
SHA-256: 7a21517a03420d151255b7fd47637907bbede9469d28a85ab6aa41c2a9415f42
font_01_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 16752 bytes
SHA-256: 7ab5c25f1ae11c9b82698942116a1dd9039aae023b2193a65a0ebfad68f87103
font_02_sfnt_off00014788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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