Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d82e1684f6263df…

MALICIOUS

PDF

74.7 KB Created: 2021-07-06 08:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ea81662af27349ae19cd684c13f0f6a3 SHA-1: 4e87a04406d9f8b43130d64a1c93a82a351f4331 SHA-256: 0d82e1684f6263df5e391a2948c7c5180c7b419e88a91f0ee7db1107f2428201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=22+subsonic+in+stock PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d002f4ebe91---kupuzutesaperuvuwurife.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/jefuvam.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210616_133158.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878249ef232---7023786635.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/75292148207.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/pajisig.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2fc1937d43b08185fb699fd99402e8e0/16198849350.pdfIn PDF document text
    • https://ka-base.no/images_students/files/63554410160.pdfIn PDF document text
    • http://learningkey.org/userfiles/77400427352.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb23c38bc75---vazeganidarenuxubi.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/ramenazir.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ijjanb56tc9at04gb0fefm3m0v/vokive.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fimedigup.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/megidumexixanilevufu.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/kifesevasenologatuw.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1b06215ad9840eac461d071b873b8c90/81113725806.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d5213a1d2---63290285322.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c191d9a4f---9845017205.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c89069964---kunaxonativakatasojupuz.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/rhbn6t3nj6nbmb1pqi9u2ot3en/pitiluwuzajineriwosod.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/22689302706.pdfIn PDF document text
    • http://coffee33.ru/archive/file/8779337280.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_off0000c2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 16856 bytes
SHA-256: 0376e8c52238db8c4e8a0b63291e53dcdce6e13a21f8b473e014dafe7b513df1
font_01_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 10140 bytes
SHA-256: 6bdf756e901f640d3b329f8300e33f24675900ecc578241af39632e5701928b1
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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