Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb7c9c0c1bc9e16…

MALICIOUS

PDF

88.1 KB Created: 2021-08-18 18:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aaac689ac1f67d3d4074510917019454 SHA-1: 9ce72d57575a43a00c0fd56e0b98ade638b9391e SHA-256: 4cb7c9c0c1bc9e1625235223a58ee96937a89c288c6beaab87f98be7a8171fa1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious links. The heuristics reveal it functions as a link farm, directing users to various websites, some of which are hosted on compromised WordPress installations. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9207

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/5e64e501f840c94873714a89d31b7ab5/98551638991.pdf In PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/40713783896.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076d565dbe1f---lufotejifivajepazisepiru.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea778d544---kerapagafibubinonidepes.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/fenedesod.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/jojaretawibunodav.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8bc2b5d5---33836546565.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/20826177197.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/44576658228.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e67df526e17976000207484b2eb7d451/36477255196.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c70e03356---takivekefikusiduvufimiti.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f11c390ca5ea63103e5f78c422254f1b/zejenedetu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/21679674641.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/97047482042.pdfIn PDF document text
    • http://yilip.net/userData/board/file/gasamufulewutovoso.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c3e181bc45ee338c3f3da573cc59aaa1/14102925844.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b4483747b3be0f2e049161ec6265ada6/92228143400.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3697040925c54d719d61dd4c37ac481a/44833872679.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/vamodobuna.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d8c768a1950fd1de4d5a47743ed53e3a/zafirifuzeduliji.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c2595468---16189050558.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/eadcd658963911bec167dc8ced5c3354/87164380614.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8ea7afa4609d6a0b29a6a413e865031f/rawovidodojabirojekof.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/64369661504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=les+contes+rouges+du+chat+perch%C3%A9+fiche+de+lecturePDF link annotation
    • 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_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 18676 bytes
SHA-256: f2f6736c75a973988fe9d0c649900bfb2d4fdeda0718a9da536eb6f6cea69cd2
font_01_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001462b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462B 11112 bytes
SHA-256: 7ea4e90788b45d412cf940bac67c104564d3f228f9943d438cdd3b831a72e1c2

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