Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d07a68398f9298b…

MALICIOUS

PDF

90.0 KB Created: 2021-07-25 11:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff43d28a986953ab5ab39b1089310915 SHA-1: b69944f16d33bf86dc82a742407cc31a0ca7095e SHA-256: 1d07a68398f9298be7c68011ec37b8fc6eca3c46752fc076db94a1ecd26b5c84
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature through its structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ptkas.com/kingkong/userfiles/files/papumusobev.pdf In PDF document text
    • http://omni-links.com/images/blog//file/89823284665.pdfIn PDF document text
    • http://dzbnf.com/upload/file///regejazubeniki.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/xatubeboxutitune.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/rja9gblgs0qf6q2cs1c5t5qjil/85163367911.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/tanoku.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/58842521072.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/47bb426308374ccbd2fb6c06808b51fa/tanilajijudopowanakut.pdfIn PDF document text
    • https://la-klamm.org/Files/files/zaxalul.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/vezilakipamu.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba09fba4b4---9375944003.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/j646c7hhs998cfhla4u8pp8mig/jififelepil.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/83724936491.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/sifupo.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/97399458112.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/gejoxu.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/nimuzasugiv.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07e802bad---62328887883.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16078114e91fe2---59007743482.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c117396da3c---19730050371.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/7596057149.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/35699bd198d368896f49bb31f19a9812/8286655475.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/13713891393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=planisferio+sin+nombres+y+con+division+politica+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 11104 bytes
SHA-256: c9e15c1a2d81f384397a73aefe7c6b4ddf060c230b8a05c133446623f25611d7
font_03_sfnt_off00012754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12754 18840 bytes
SHA-256: 7097d6e2b0f660816664f511738064c77aa50b705ad03b372736f5087b20a297