Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7e39f7ae7497a6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 15:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a391eb06406b63dda58dd6a9c6fea57b SHA-1: 1c7afbf7ae92f2cc9545dd30faa97814b91c6569 SHA-256: 5b7e39f7ae7497a6462a17356029e9caff8594d3a8d02199ac2a433cd7187496
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://tasivn.com/upload/ck/files/93471625581.pdf In PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/saruluxute.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/gexasosevopijigivigelow.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a7d99a28---xajozopagedum.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/zakanovusota.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613478dc62b13---sopen.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/90390958193.pdfIn PDF document text
    • https://flyags.com/editorResources/file///wotoxetumisiratuditodip.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/21619905921.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387e0529d77---10370325289.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/65072784033.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/98421991831.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/kepumidisa.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/72205167123.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/347a8f6b192cd0cc486e420d942deabf/88102301294.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/woberuvizetoditedelodu.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/34105851178.pdfIn PDF document text
    • https://fishboat.hr/files/60396293249.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16150ff2f2bd63---27207026211.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/pufiwofurijezeja.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/worisalaguxeper.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/89484512216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=befikre+full+movie+download+filmyzilla+2016+bollywoodPDF 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_off0000adf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60B 15136 bytes
SHA-256: 32b8cf446a30fc87f9d02375b600cc9e56083175ba909ad79d336d9bc1311122
font_02_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 11424 bytes
SHA-256: 26ffca4708e17712c5b9c2baa375b4712ae2d8e3e59e6f65453f81cd73cb952f