Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f4fcf5226b070b…

MALICIOUS

PDF

82.1 KB Created: 2021-08-17 22:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa2a051e408db2f64b85cfbd1c022b81 SHA-1: a7a59ca514b6938427abe3569708991bd1ca4839 SHA-256: 45f4fcf5226b070b7b0f770fafb3758ac88ba58e47b593bd0d924b87487870d5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The presence of numerous unknown reputation URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://gabortech.comadmin/file/zunazepirinewakedip.pdf In PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/4322137758.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/bikiv.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ce8641b8---58675974464.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/06rt6le3440fp8spbhspoubjf3/xujizufififezajoki.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/veludefokisomob.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/64675842794.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117e9c3183be---60891186789.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6118ddc22---92493414390.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sitl0l0kv8htes14aenfkd51l7/nozivubemufuvasusima.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bcd6c74a29f106878799fb91460b843f/34913471689.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec1958edc---fakap.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/51464402073.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ab468b2a---34950171380.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1485720070608a8df8e7f06.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/benuremeporikunatibudolal.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/19262956038.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/tobupatatimiwofimut.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/23ec9pmhbroo7ms8ko6rf7c7pd/95669986680.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fdf05f358---xatur.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/12034222952.pdfIn PDF document text
    • https://comfort8889.com/upload/files/35829568149.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3df66bba27---35498541374.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/c43909faff3474f3d2a205046db7a5b8/41990906935.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/wirudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=is+phineas+and+ferb+christmas+on+disney+plusPDF 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_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 11188 bytes
SHA-256: 9fc55fda360c1242f0049b2c304743a652a8a6e53f4eab6a318243f0b1ee04ae
font_02_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 17476 bytes
SHA-256: c9223baaa460024c5d9692db2823c0e187b5d3b84134e54bfb7171f16055d46f