Malicious PDF — malware analysis report

Static analysis result for SHA-256 df698bb91847f3f4…

MALICIOUS

PDF

103.7 KB Created: 2021-09-07 07:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34eabba1cc3c53794bd5aa2adc7a9295 SHA-1: b0ef948b602d7f1ebf843db20dbfa5bc937d5eba SHA-256: df698bb91847f3f4dc1b92fb4b100ce4649da7d4b5672439a6dad3ebd5a730e7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious payload or phishing page. No scripts were extracted, but the presence of external links and the high confidence verdict point to a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/df3207cd7db965974e1879469e6ea6d1/forubutimasa.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nufll7v80gq00i2436d0a85e2o/mowiba.pdf
    • http://www.uc-kushiro.net/images/library/File/82164802216.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/77463124600.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/88732e7441035deaa3addf9d26941d41/32599650856.pdf
    • http://carrasvilla.es/uploads/files/78659819575.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be352814613---rizogazazejomewiluno.pdf
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/34190833042.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1235a09a4a---25209588643.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/38bd1fbfdc5b07a40c8d69a6d07b4c0c/nolelirinuwinimit.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4tri7bbrdsqu68202vma2ae8e1/fojuzunakopuza.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160857a9d7d9b6---lupip.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e28eb7af4---numezefetelodozajiru.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/176f154aa5fbdf7bd5028ab03c144663/mazonaguxisabosaxew.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3e95hqgo7glhp9rdg655oc2au3/34420779969.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52b580ddf52b3d8234e2f892e8d31e6d/10671296149.pdf
    • http://abwalabamaave.com/uploads/files/69548729758.pdf
    • http://ngocvietbungalow.com/upload/files/pufumulalogamas.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d114576267---97824564711.pdf
    • https://vaynhanh365.net/contents/files/fomotavazokonozakegela.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/29517c7cf18d0659f99ccb8dbf2e1212/36265347137.pdf
    • http://afgventuregroup.com/cfiles/file/93163538522
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=metode+penelitian+kualitatif+deskriptif+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_off000133a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16792 bytes
font_01_sfnt_off00014bba.bin
a6131dc29ca3240f9bab578dfcac07d5e02e032d9c2c7a58ad4b2b9afd68f068
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBA 10676 bytes
font_02_sfnt_off0001644a.bin
3406c6092086a080cc8599fbf8f7a4f945e520774e166ddcd6824c8140bc6e93
pdf-font-stream PDF embedded font (sfnt) at offset 0x1644A 17044 bytes