Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d71dac4152dbfe…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 03:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54c9d535701cfa28d5416c552dd211f8 SHA-1: 918d210efdb90d07f2a62dd81dc25e7d39c8539b SHA-256: 65d71dac4152dbfea71637450df6c2d891982e232a51e6b1d0842b094ca8124d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=18+leadership+sutras+from+the+bhagavad+gita+pdf PDF link annotation
    • https://clickbox.ro/images/file/31050577993.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/gumipikurojobisufagomip.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/niraxuximawumejeborad.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/9s9jg2bmhnqvcvtrfdor91h91j/50971481844.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/332a9440919e1776a34672e7abd90af3/fabilo.pdfIn PDF document text
    • https://12tiga.com/contents/files/puwoxegavisev.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/sogofiwu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zazulanudipemebe.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/nazujuvul.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/retagebopu.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/85153325877.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/84705445599.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/sevazivalavezez.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/85275113464.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/darubidir.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kibigamogusufaxonimomit.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/vimire.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138423a49940---94881969383.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/famemupejodasisunajozagus.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/24817345418.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109021222309764.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210909161135.pdfIn PDF document text
    • 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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 11308 bytes
SHA-256: 3cfd0bbad604da32358b329db0d483942807a9287bc04caddb8a69736eb2a89a
font_02_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 18028 bytes
SHA-256: fd2019a34cfb90e0d0d50b9ec707fa18b4479499e16cba02f0be9baca3459a21