Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b47b82c1bad73a7…

MALICIOUS

PDF

117.1 KB Created: 2021-07-19 01:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d116df367139706d36e6ca2634a160ce SHA-1: 13645b9640e3e3ca871bd4ae68f095f9243ebdc6 SHA-256: 0b47b82c1bad73a7df6c98f83cbf74c91d96e834a82d15237959d4fef263c23a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external PDFs hosted on compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a491b0f8301a178a6172e1c20eaa169/76358699622.pdf In PDF document text
    • https://bawwabatrizq.com/userfiles/file/19567272964.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/dubanesukem.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/gisewetuvepeledobaforela.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921cc9f225c---tawipegigekarinus.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8edc31810c---60673271624.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/160aaabec50e4dcaced5b40885f8b659/zanuvuwudulepubeja.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae5f0472ed---32346858223.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/6cc217039c1fe8ddfbd598c079d8a0fb/miwuwekagarawiwovawezot.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/48749914089.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/57369039807.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/21981777657.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/gidumegazolejorosisavi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/vck1ds2n5e9m9tk488fi2otghl/55846908059.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/lagarimateginuburamafaw.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4259954e97d498a96656719715b20681/bexuvedejidutoro.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/9iuim64hiaccg4tiolelckslk6/zosinevupogobubofile.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625603747.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ce9ae9caafc23998750b71e3b5167331/42127056638.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/759a75f57cc7ecbcf71082ba942b9d95/sonabunifixagabixibe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/p250ae8kic1mcku97d9sgp5il5/tagisaneseweli.pdfIn PDF document text
    • https://ubranni.com/uploader/files/gikikekunefozokomurenok.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922c611c3d9---3091234483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=virginia+woolf+moments+of+beingPDF 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_off000167e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E1 18736 bytes
SHA-256: 40c3d5414bbd31c44c1f2423bace6c1d58e6cdef5a71f5b1e98e77f9676ed13b
font_01_sfnt_off00019669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19669 10752 bytes
SHA-256: 6665070bef95513072a912053a10338fdfc663d926defc630d6c3720172db239
font_02_sfnt_off0001af3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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