Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd967b221db73a28…

MALICIOUS

PDF

96.6 KB Created: 2021-08-11 21:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 172d820dda59da5b42e1c280edc918b1 SHA-1: c57e83e0031f2c83ae6c8efa9f280b3e5dd45539 SHA-256: cd967b221db73a28af25d95671a199693b133fab56767dfb97cce64cd417ea01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely for SEO poisoning or to distribute further malware. The presence of external URI heuristics and the link farm detection strongly suggest this document's purpose is to redirect users to malicious or compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ada91d05b---nofed.pdf In PDF document text
    • https://girilawfirm.com/content_files/files/86762157696.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f2c2759281415e65beece299b824984d/kosadowonix.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607540291df99---59449579103.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6aa79aefef64a698e276832e5352a681/kubipel.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080245a51f91---tarafekafek.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/q350jkfkto1uc0cssu9qcqsbp2/komugisetogopepove.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796e1c1ab04---fodanifogewaz.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/19830299431.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/04a91db88d59eb423225ef5f7b6431a6/5697116946.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b19238c3043ca6640ba73024574d3844/xajipuboxerug.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096e092e4af7---sizeliladapobujezajikuxit.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/83307041545.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/86457182223.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/zoximalo.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/dufizodanefasuke.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/77872709614.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/56520588819.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281226535583.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608200d3d84a3---vugalerasekakuluri.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/5f3ff8b7416763521ef128678b3cfc6d/funubakepebeluduguzoz.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160751c62b4729---76274451728.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pf62acf3t2ljje8lv1kfq9nuuj/31490094157.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a715787f4f4---12688086572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+does+a+black+and+red+bead+bracelet+meanPDF 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_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 10768 bytes
SHA-256: 597b4b3f78fa44f33fda84de2dc99b4923f2458416c5080abec4f8afbd265b7c
font_01_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 17648 bytes
SHA-256: 53f49e0ed78b2336c4283f1114ba3be2022b2e88b7fcfaf123a5f1d6b01f19a8
font_02_sfnt_off00015c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1