Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4aeeb75a5f4a3b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 14:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cde207d5984db9a5562273831674a3f7 SHA-1: 935544763ebdacf6d05326d564353c1fe62b7d17 SHA-256: 8d4aeeb75a5f4a3b2f562f1efe165b0e85650b519b8f00f8da02c30d5fa0dc87
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various PDF files hosted on different domains, many of which appear to be disposable or compromised. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a tactic of using link farms on potentially untrustworthy hosting to distribute content. The 'SE_QR_LURE' heuristic suggests a potential QR code phishing vector, though this is also common in legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=how+to+share+photo+album+from+iphone+to+android PDF link annotation
    • http://baigeleather.com/userfiles/file/56700607345.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/69100712424.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/51889546608.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161471323df9f7---wolodime.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/28651495160.pdfIn PDF document text
    • https://argumentua.com/i/file/kowafog.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/80343720802.pdfIn PDF document text
    • http://wixoon.hu/upload/file/delafir.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/koweki.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wuxodefejo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcfc4878da---kufapumim.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/70427276361.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/nazez.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/63772229641.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/20770200412.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a52c083b70---45566051700.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fec82dc145c01496c5d005bd61ec4b11/kajaduge.pdfIn PDF document text
    • http://retailcop.ca/files/wumuwadafuvogitu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415931bf6c5---89821853142.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/sowifapogisumel.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/boximojodigugafazutupaxi.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/kawanekujusa.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_off0000b878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB878 11080 bytes
SHA-256: 097a7dcf196413422f13765dbb910211319135eb93eb82005698fcf7e0105e2f
font_01_sfnt_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 17476 bytes
SHA-256: 78e931441cfc3c65b631ebe03c3852cdd98a9d66dd42264682dba2bd29f8fee4

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