Malicious PDF — malware analysis report

Static analysis result for SHA-256 00795b5fee42de22…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 00:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9b73adf9e92ca92a3d2a5f51a6ac012 SHA-1: 9c8aba2f4f2c32fdcbc2bcf8735d10f432e27aeb SHA-256: 00795b5fee42de2263e25a15e2c2d005304196b4c4b8e8ac4f11fad574d62827
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The primary attack pattern observed is the use of a PDF as a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dautuck.com/uploads/userfiles/file/mifebep.pdf In PDF document text
    • http://congtrinhnhaviet.vn/upload/files/bofumizarudipogore.pdfIn PDF document text
    • http://vhktn.at/images/content/files/28174926597.pdfIn PDF document text
    • http://newo.ru/files/files/kigovotovutiluferesuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9b6d2534---24759692927.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/tunusakubukedekotaveg.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/bugonenazosuz.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/75690135338.pdfIn PDF document text
    • http://schokobrunnen.com/idata/munero.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210910052048.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/52430502551.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/8502787942.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b17680aa---laturevesexakaxate.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/93130268563.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd4b24005---23730004770.pdfIn PDF document text
    • https://vendax.ro/files/file/23988868123.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kukogekalenesusurot.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/muxuw.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/famipidi.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/8395814065.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gekekato.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce54cfd3---31686052360.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/32953083197.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/zidewipula.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/89060450215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=different+active+and+passive+voicePDF 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_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 10636 bytes
SHA-256: f1a894fd58f219c2de7bd308e895b6e478366d76e66cf40f11365ebf51ba5c04
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 17612 bytes
SHA-256: 1dc5081789a4698d72d4eb98d04bc5f9b00cc5d4d15c8232245454d75674a86a

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