Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6db22106389d232…

MALICIOUS

PDF

70.6 KB Created: 2021-10-04 07:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ef4e5d34826720c179ff616443bd03b2 SHA-1: 49171797f053d0672d98cfd154a6ec6052cacbb5 SHA-256: a6db22106389d232eb98520ebcd1a75ee4cf009e16d09557da42488dd86c3ad9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous PDF links on potentially compromised CMS uploads and disposable hosting suggests an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tennis94.fr/img/pics/files/tukepatotonugi.pdf In PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3118fdba5674995f2949272b06c2dde7/869163491.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/muvopo.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/5740875745.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/33861530722.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/xirana.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f39785d663f47a80f71cf778352192c1/98656860945.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/69609081365.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161453a6080d9c---53528556539.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/64990066002.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/rejuvigotufobapavut.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc695e0f71---jakedidukegiko.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/60384627616.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tilibemin.pdfIn PDF document text
    • http://eternaseguros.net/files/files/bapagomaxafovom.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f34696a945---96616332429.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/8249877181.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/kififozojifuj.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/nevonibujog.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/89761417396.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143a907ac1f0---4872930695.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/59880583447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=jee+mains+2016+question+paper+with+solutions+pdfPDF 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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 15664 bytes
SHA-256: 1c0fa485bfbed4b46631f108ba767f5a97cf222d67458d88c0d2a66b6beab654
font_01_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 11548 bytes
SHA-256: 4cc7c725be3c5500a0e1c4754e5ba9a3276197b22a0bd497fe05f57b7ec9de83
font_02_sfnt_off0000f422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1