Malicious PDF — malware analysis report

Static analysis result for SHA-256 da484a514d23dcd9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 07:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ba253ac474f3be2515399ed92fd5eca SHA-1: 0acf842bdaa7f93a2d0a21b1ae9f02deb2471162 SHA-256: da484a514d23dcd98bbe2244fd9dbe6d1d27f5d877021af64015dbf5265960fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=peter+pacheco+an+introduction+to+parallel+programming PDF link annotation
    • https://jjcfurnituremaker.com/userfiles/files/72722505505.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/98875440699.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3t30sflig0gem8nd0a5014fsl7/37177142614.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/futevupanezavefotip.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/84f2868feb169ecb7de665701153f452/97529477146.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/0e1b392dfd33c901699f20a2f41b9ee4/51936499949.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cec146a5fc8---lezudebifevamuvekalowof.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f3e21f1c301b2a1f50a781e0451bae00/mesimaxadelajodetixiju.pdfIn PDF document text
    • http://belst.by/upload/file/mesewelefega.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161004381cbaa1---jujipibumagirivome.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/72069501569.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/tulejupawatubuke.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/427a9ee4d8a872d29bf4bca7d8fa24b8/vedofalaxi.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/xiwapilaxodawawiputebural.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160788a6d2d8c0---nosiketejepajin.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/40167470923.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/22872091075.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/pobena.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/sa26krhmbl5ehdrr81gi6461h7/54862103967.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g1a8h4sus8m887iioigoc7d2n1/defavona.pdfIn PDF document text
    • http://fittbikese.hu/files/file/43477056236.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/fijuwupija.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_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 10896 bytes
SHA-256: 7446e6ca64f2a201fdc411c1dd3a1ec5569a07faa87159a2f6354a7684af98cf
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 18112 bytes
SHA-256: 9448ac62b696925d6facaae64180b79037ad4df4210446970c864035e9c53745
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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