Malicious PDF — malware analysis report

Static analysis result for SHA-256 2306093de38701ba…

MALICIOUS

PDF

113.1 KB Created: 2021-07-02 04:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9bf02535f97a4001817e2f37c169fab3 SHA-1: 483ac837d4deeeba329c02f6a33d27d8ec4aae49 SHA-256: 2306093de38701ba94913ad7d63e2490895e73e7d462478db803b85721085ce4
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 ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites, likely intended to redirect users to phishing or malware distribution pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/90300949353.pdf In PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/b572a23a111fa7484521d6256cc2ca49/96838797428.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/vowuzojab.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1ce73f4068708bbcfad7fadc8b9268a7/rafet.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/18933a1b8a78b09f165f6569afe4d84c/96378502427.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/giminir.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/bufebedixu.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/15934305536.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/006b544df1819a1e3017d470b7e47ff9/26353757842.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a4ac9a74da5ebf36208abb93ad6d9612/84922844289.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/65247339f1b832b7d0c155930c7fa03c/17089724550.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/keweminekibafagigo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b7c4e3f9---88040120439.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/78238793687.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cbdbda5bd---zugubadakivur.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/10121720797.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d43f96a95b1---vufijajofomofuzeta.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ff0398ad8---dapapab.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa67d1a90a---mibilobidalata.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160db0aef05eb5---vetozukunidaz.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/66d43fe98c067b9a375e40b84e293606/joxuv.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/fivatagelakalemusinezome.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/98090560946.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8f8e7e9d6eefb7969bf01d755fccd9b8/rinimege.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0d62fea779202a144111a1f5a54f6cdf/vabururitanof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=30+year+t+bill+ratePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B02 17216 bytes
SHA-256: bbb2805cd4150bdfe84b99ee9c30a6bbf9240ca5577ace0976852fd9782b78de
font_01_sfnt_off00018804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A01B 10160 bytes
SHA-256: 0860828d318c111c37025c5a780fff0f364464ee52b76832861f4d2b9decf8e2