Malicious PDF — malware analysis report

Static analysis result for SHA-256 43615798b99d0ce6…

MALICIOUS

PDF

82.7 KB Created: 2021-08-10 18:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9883c130431e8c85f13830d3ac3741f SHA-1: 1334e2b90d7e846ac5526b4a1ec6fc22968a0441 SHA-256: 43615798b99d0ce696e57aebc3349c7ca9d91fd5c1b6771319decec43e2de889
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination or to generate traffic.

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://aiwatopup.com/ckfinder/userfiles/files/24397695128.pdf In PDF document text
    • https://retta-bg.com/userfiles/46643179753.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wafazepu.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/seterenitenuz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc242434c0---mujamogeve.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/podakepufowujutubox.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075861f3b321---37061529872.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a7124d13---89197737422.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/muul51j59vgbeqaqjt4v2jkbh5/94778386637.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2070a981eb---xajejomerixanusekim.pdfIn PDF document text
    • http://usagimatur.com/files/others/26158616261.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/8226976541.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/41903144975.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e8c0a95a0b1a030ebbfa0883a2fb3c57/xotegatixuwadifej.pdfIn PDF document text
    • https://yuss.it/file/5703035251.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/68h7lulatgrhsmqga1pqgmm2q0/wuledatejonubudujunusol.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ok9j66fjfephc9eu6as57ovjv2/dipepumemu.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/soleguzuzubarofalememim.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/13862538289.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/sajigugipej.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/31524724015.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/jikizabusodetosape.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/pikotofizaxizelisali.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5632757b943855ef317afefbd02f46dd/47080778279.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f86142e62fd3681edb08b7fba18d7608/kezaloderasuvarafifuwes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=jci+7th+edition+standardsPDF 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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 17144 bytes
SHA-256: 72124a3cba39ab704a0644cba9c528d9200a961d01b52eaec9893b8d514cc5c3
font_01_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 10460 bytes
SHA-256: 26fc8e2a8b96bc8475feb215660ade06818942e121f011214d28be5f182f8024

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