Malicious PDF — malware analysis report

Static analysis result for SHA-256 de05028932b0c906…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 18:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee68a15a3004dcfe258124ba61d0f58f SHA-1: 314bf195417e44903d4a0bf8b5972b0a6235d69e SHA-256: de05028932b0c9066b1421cc39328af200a745fe6a2c60bc36afa5b077a73159
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://palletgoanloi.com/img-dn/files/22141179053.pdf In PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/63131399960.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7522c154bbe820a800a491fd756ac7bc/wiruxoguvak.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/58382039855.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210918_232017.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/85981544612.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/58447346530.pdfIn PDF document text
    • http://temple.mo/userfiles/file/zomisiretutakuxedatinixo.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/40104050728.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/21496530127.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74787674383.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/jidafowaxav.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9c20b61e5f74b5b172717ea0bb8c990d/4890598148.pdfIn PDF document text
    • http://adice-area.com/pictures/files/tanenaxozetovesivaxesoz.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161467ed51ac6b---36821297409.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/kelerim.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/misoxupuduponexo.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/fixojowabizu.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/xenazijadasogofejopa.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/loragadisalefi.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/gezigobonevamiregot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3d94d62b---36685079866.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/28042145672.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/17290174130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=anna+torrent+magnetPDF 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_off0000bdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 10124 bytes
SHA-256: 8a36f2a6bf3dfc452a4aec0208602c836f7eb873e5f74aaf4f1b8f0de21166a8
font_02_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 17600 bytes
SHA-256: 64d2f5b06ef8aa4b82813b7ef72abb6cd8fec6a5c5ac42f9aed753a8e4e09d72