Malicious PDF — malware analysis report

Static analysis result for SHA-256 0313a914a1b12e75…

MALICIOUS

PDF

68.7 KB Created: 2021-09-16 04:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7170f2b0cdb63e5a5a2d984b43375da5 SHA-1: e2046b4339e2e1b66ec9e62c8e1444cdf93fa067 SHA-256: 0313a914a1b12e75c34d1c5cea20f5a1b88987a709ee7572f7f6b5f132132821
176 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also flagging it as a phishing trojan. The heuristics indicate it functions as an image-only lure, containing a click-outward action to a series of external URLs. These URLs are hosted on various domains, many of which appear to be compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=how+to+print+pdf+file+from+computer PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e5abaa1a---tadenutiwewowubavatafupug.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/25473935271.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109041757414073.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/42671136526.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/34048475587.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/vegepizuzopufaxak.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210912073427.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141137c1238f---95929707456.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d38b238a---kogederosa.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zuketaxaguvo.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/46465476692.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/zovefelelaxidupojo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e86bade25310ce7d9397dde16cb2b76d/30888397371.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/wijefibup.pdfIn PDF document text
    • https://foulardfotografando.it/file/josiv.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/zojuwe.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/38565933571.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/82444256159.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109121917055158.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2991d98c---kexinaxevefovofe.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/dilumitatijukabiwuluvexo.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/84876996983.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/wabumaxixejuriv.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/fasagelokuxadopikafoxemup.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zopexurinabekamepowamuka.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_off0000b19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19A 10628 bytes
SHA-256: 83af2a8705ed23e173ae198294ae1ff43e0eb9f1a09f6ed20bc509d86f6d575d
font_01_sfnt_off0000c9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 14220 bytes
SHA-256: a82753bcc4895d9f0427241dae01740e6ce4e481e054dca8bfd81fef5a828a36

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