Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14f451574b41714…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 15:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2df0024bab89f78f49930c22238833b2 SHA-1: e5ddd1297fe2afd899e9b498273fc835e4e04106 SHA-256: a14f451574b417146b2ec83779f1f5d65f8c239b0f45d25a0aabbf11a773f994
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mvmdigital.gr/files/files/95374029041.pdf In PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a34153df79f84d6571d806871d5c719/towuvupufuten.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/tajabuto.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/29445471281.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210909123131.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/ruvoxunalexiva.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/59928278827.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/25191729482.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jufinolofadotetixibovafol.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zexopunemene.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/034991bab3e09d75fd9533a4d71a95ea/noravukamaxaduwer.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0cdfe9651ac4f6176a638382f3d71407/31519960881.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/10314513735.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/359d4c0cd0cd29a57efbcecdb77e4006/loziruba.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/nerepul.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3550b75e4---suxojexadelebukitadife.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/82004573216.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109080849537950.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79383251d---lusunivukajabexidiwunivep.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/18713771834.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/lagedutigojuxul.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/77609235418.pdfIn PDF document text
    • https://blokhol.com/upload/files/33160699720.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/doxigaropezasomutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=similar+apps+to+aptoidePDF 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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 10524 bytes
SHA-256: e93329de6c9a8efd6549447f1e3371dc79f27b5300d9cee25db6f53b80263c73
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 18388 bytes
SHA-256: 6f6649d052b44715f8aa104499bbe657539e0e5e333a723a33bfd0579659d649
font_02_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1