Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86296c6ac06dbd3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 06:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41ce1dc80dc247e5ba1d5cb5b039fe05 SHA-1: f17d759830f6886a9fcb32e11c3d8db9ae053bc4 SHA-256: e86296c6ac06dbd33853cfcbe3015409123fb24bed49da3f5eeeeb8e06065312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cc456ad56dd3797bba9916666ecd5296/ladoxuwotinalij.pdf In PDF document text
    • http://mingmitrcoffee.com/user_img/files/13903777311.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/jojidadobikeriretotilu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/95886992194.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/22518775600.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/nifagerulip.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe99e8ae23---xoronekisusevuwipuzaz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/20791a9d5e49e9795b362b79b6333356/fanifigifojuwit.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/fezewowazomidelakoke.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0540b18511---tafuwidebiperunofexogez.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9798e5f9---96328815282.pdfIn PDF document text
    • http://tipiland.net/upload/file/49852413028.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zoduzofofuzamuzusomen.pdfIn PDF document text
    • https://ptogel2.com/contents//files/79845342782.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ke83su8rbrvovbs0t5acu4ini3/50545786667.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6340c2b17---94138600743.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/85312332417.pdfIn PDF document text
    • http://hzqzg.com/d/files/47840273416.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784638549dc---9061040607.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/668ee164588147536041d88fd00a7acf/25291647194.pdfIn PDF document text
    • http://jfe.hk/userfiles/befosepur.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/84523283708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=touchstone+level+4+student%27s+book+pdfPDF 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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 17696 bytes
SHA-256: 1ec3198e0b7a0995f7562254ebf157892a08aef47cc7a9d0ed62fe7647e83c30
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 10836 bytes
SHA-256: 948ef4e10563294f4f9de3eb2767523ea94c9ceb87d7a942a95fd984edd4611c

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