Malicious PDF — malware analysis report

Static analysis result for SHA-256 51301cdbf2b1dcfc…

MALICIOUS

PDF

102.3 KB Created: 2021-07-02 02:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 837d9fb5b7a6b7151544f18f25b4b0e0 SHA-1: 4b506f77e1155ac1a3f6ff9f1d95a365847cd6b9 SHA-256: 51301cdbf2b1dcfc17ea1743ece1031ba9d868ac19b1b8328b56dc7418e0594f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a phishing site or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://queure.ru/uplcv?utm_term=you+make+me+feel+so+brand+new+i+want+to+spend+my+life+with+you PDF link annotation
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/457f6a388ae3691134fee3b1e1a9f4d8/52825840712.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e76e404ad---61719514292.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/54535324513.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30da537f95---vemenekezawufet.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/49067813284.pdfIn PDF document text
    • https://khanikango.in/file/62640488766.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/40669481139.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m6k5pbeahcan339i3mu8ft25vb/vamakijimokepafezid.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb86ab03a11---siludofogagirezib.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/2168637300.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ec866841d43b20d3b87b923ace5c961d/xixonewekejasasama.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/46266106558.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/53936828420.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fc1a761a9f6b0204b8d4f5f0e72a177b/44508278659.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3fa42fbfeb674c34e56caac62e91ca75/37390592989.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9848c89c---15499606399.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314d857bda---23552298697.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3b9ae332---vadolaxupezomofa.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7b4c8e8d1---86036452309.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bikekelegudiraduwopejoke.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d872dab3ccc---37363921056.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/gugegepadipilepipuxemix.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/79172664282.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_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 11280 bytes
SHA-256: 72bfdbd246c513d1b21a87466d2559172070e72d35d2fbf81631b73a6ba4b8da
font_01_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F05 23056 bytes
SHA-256: 958077706f229df7bea45b97550e1a83f8ce2b34b3fda336388a5a090a090faf

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