Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc01844783ef3785…

MALICIOUS

PDF

105.5 KB Created: 2021-07-01 12:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b72d7c8f17bd4a5f01cda05ea6c4571d SHA-1: 8536c8be21d99b82971ffc7645ad5864da7b8139 SHA-256: dc01844783ef3785859c9a99a4bb9a155b09a27c9f1dbc5cd58fc891d841d0dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites, likely intended to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://wannawwannie.pl/userfiles/file/wegimo.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/l9q8ur1pccejlo13k0k8hh2sg2/dadijuwosipi.pdf
    • http://becucci.it/userfiles/files/konuxezorib.pdf
    • http://ibtaker.ps/userfiles/file/jatoxubopuredulaxijupewil.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/01n2e8vogvs63lhv3d6nplb120/lubujawazulelonijuxikikuk.pdf
    • http://lab4050.com/upload/editor/file/wamalonojif.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8376ba1773---77337203370.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7d383df150b0bf549e18e971f8a0ccc5/viratutenanawelujegag.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcccfe9d7f---miworikararibasejora.pdf
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/49vd44gu90unoiil6k9mqui5qs/rifejokavogovomadufuf.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/jlmep9hhd2fm8btiq5lru56kef/rirorejunusuwotitoxaxo.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/mizapeweginakiromotoxu.pdf
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/lamigexifadu.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe62fd428f---97348456511.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866a6e7a774---32420904368.pdf
    • https://x-software.cz/data/file/56399000326.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5c1e3867---wuwewudalipodadobuje.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6219aaccd398f4ea4a8f9c570d3cdf8f/74338537874.pdf
    • https://villatoscana-pi.it/userfiles/file/rolulugixiwalubege.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c1651df1cbc877eba5c0d3606aabb62d/70722357635.pdf
    • http://sun-green.de/ckfinder/userfiles/files/zegifutu.pdf
    • http://pinturasoltra.com/images/slider/files/69446880474.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/tijadawi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=nmap+check+if+host+is+up
    • 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_off0001387e.bin
e93bfe62247ff96fd23bba280478a40d79130217cf6f8c04a4b3e92d1f16bb69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1387E 10664 bytes
font_01_sfnt_off00015100.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15100 16792 bytes
font_02_sfnt_off00016912.bin
13630568beb65c2f69e3dd13e28e4a6c55d047251b19b1c5975d9c8182708c72
pdf-font-stream PDF embedded font (sfnt) at offset 0x16912 18176 bytes