Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7da74a40cc71b65…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 08:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae6018c8fe167b675621a176d6fa9330 SHA-1: 681466eeade5c6bdd9a1cd304b48fd6fb62d9b60 SHA-256: d7da74a40cc71b65432d51b6e625d781599d9d3a7460bd9552c39d1670cad0c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://motolargo.pl/userfiles/file/24100586172.pdf In PDF document text
    • http://recrute.fr/files/files/76592283028.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/vaziruzafisivuredaxelom.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/lijigunixopuvaduwen.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/12708034728.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/80710642385.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/62629902081.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/33126860103.pdfIn PDF document text
    • http://lecostationery.com/files/file/85537568727.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a763de183---14843653857.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/jatuvokafajulo.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/temebudefowagiluzebu.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/fepoki.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099eab4ad079---bufefuworofezabulutikuza.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f5332b09---pikoxuzetitolezemenawid.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5qu2l0lkgj1cqdiofssuembppb/83311717447.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9969e310---13239858316.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/l41chkntvd6jbn57plpk34n1d5/30081053713.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/77101280761.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161196d3ae4c99---vidixasabonobub.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/71502787994.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/tewas.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c3e4587525a2c9ec93efce605cb3fc47/76940816072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=remove+blank+page+from+pdf+documentPDF 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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 11148 bytes
SHA-256: f0c5d92d3e031edba03e56016e36d832a6fac7b0285957ec4ca28780e3dd229b
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 17404 bytes
SHA-256: e11453d54ab53a459dd030d32a70120c511d482d9fe1c62ce50460273c982915

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