Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7804c0b3ede8508…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 23:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68572cf0b9e20422950e30cdbdc15bef SHA-1: db1e283d2e20010aa089e1f3cf371e8c2099ba08 SHA-256: b7804c0b3ede8508c70d6d92e4664bb98a1d054114750d3e75fc894fbcbd3dc0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=best+habit+app+android PDF link annotation
    • http://ecohouse-lab.com/userfiles/file/53351707.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/bubapemizunidosoxezorov.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/25364977481.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/23495807643.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nababopanekepinasemizon.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/juzapoduvasevefebeluduz.pdfIn PDF document text
    • https://makenie.com/upload/files/kavepumulefivaj.pdfIn PDF document text
    • https://theipbuzz.com/images/file/23716697450.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dowilawividuboxi.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/vadetunirawoxovojujapuzu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130665e2592c---42086093963.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/zafijoze.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/nimewukubovotatugaxak.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/zavofesozipip.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210906231453.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e5dca81c2edb72d74611387cf383dbee/91571318441.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131c51aa6a2e---7358697426.pdfIn PDF document text
    • http://salt17.com/userfiles/files/lerokotebilax.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/rufunamadizokitimi.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/vidatozetezilozosakupon.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/e3escle327pmg5tgvmgm0o3a8d/69881465266.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-02/210902063500679422pc0xoee6bk2t.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb0047678---ropasepadafusefexakozi.pdfIn PDF document text
    • 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_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10636 bytes
SHA-256: 890b452e28dd48821502206e42575e39cb2123fd38d9d9f838ee3128de93be79
font_02_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 18056 bytes
SHA-256: 14b461b0a6558967b5d447e433d086dff3cc557846a5e23156268fee1a9c4aa3

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