Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dd995c3c7eef1c…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 05:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8dff2449b6542217e226685aabf29b75 SHA-1: 93bff095b08e2e80fe36e4abc21547a3a6b7bb19 SHA-256: a4dd995c3c7eef1c1d37f5e3bf4c9f46c930962e624e9c9daedadac317e64003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://textosolutionslinguistiques.ca/upload/editor/file/jezeku.pdf In PDF document text
    • https://andrejc.si/files/file/46529489516.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30686627754.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/kigamulaxinazitaji.pdfIn PDF document text
    • https://saam.vn/images/content/file/88589207417.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/kenelid.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ac7c3340---dudiwutovinivuzulaxu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/37527fc58c2f940175d4f9390a33307b/setazejixonisukulup.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/ruwijafozunezes.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/40221090874.pdfIn PDF document text
    • https://csn-alliance.com/data/files/rirufuduwojiboka.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c2adaf8fb5d---pufagujimunusita.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4a4e429e---viwuzelebopakofajuwep.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc00a0080d---53638260288.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65ec160c2f---94397370374.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9780d5a99---97274987221.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/8500626433.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f093d51b---83855476385.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ru1doffkgkc8pgrh7q2ecpdaq/buguvegidoxasabovuvibe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160725d2b8d2bf---57709683038.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/55005479775.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/xipetonuvafulemagerixukuw.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/vumafex.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/11206435369.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/62630840998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=spm+2010+english+paper+2+answerPDF 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_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 16996 bytes
SHA-256: ee0bed9c68bc77c5b371a88c633ab177bc7d64ba9aa16f61ce8c8094de2e29e0
font_01_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 10936 bytes
SHA-256: 81989107115175b4c6d2ae9ffd165e8cb13a7a91053b78669e2a6b033b1e5ee6
font_02_sfnt_off00013600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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