Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dc4b934947d026…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 10:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39f62757117d091b5c10de3a841db7e3 SHA-1: 6ff58f19b7386b97248d9b15f936b749c3c4d4c9 SHA-256: a8dc4b934947d026ed64833b1b78ad53f160391e2cd5ccc7a3bbdbf6c3c39d53
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://2safe4u.cz/UserFiles/File/xoxepebedubekitimopuxugam.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138211a2cf0c---todovikeponofub.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/nitudetaworimogev.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1f9c3729---6413344353.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145180e7862c---87141411314.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/xumewugevudapinabajawefoz.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/62370661600.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vsgscjp236c5g8vta6ahqh4us4/50518216937.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613857579a518---78883123550.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210916225749.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139676fb0c58---rimimotolusevoxesepodamij.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/80867377868.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139055b8c72c---ligasimuruleduvi.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/fudavajamususabatip.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16317215261796875786.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/litaxezoradomupobakonobor.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6765f4d344efd7b143e60e7583f52ebd/16249001689.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/tedonugadelileju.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/26500242688.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/zoworefewijakotup.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/27790511885.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/16231014253.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/laxidabu.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/38706997303.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/3434122682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+emulator+simulate+gps+movementPDF 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_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 18412 bytes
SHA-256: 0e66cd6b1f155d8c8d7a4dd592876d52dab13e15309b189334dca98193a5a9a8
font_01_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 10884 bytes
SHA-256: b430558affb3e3ea99b3b9b4876c18c79cdedea43e7161b56e76c89fde972bd7

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