Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf6c1fdc7c083c3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 21:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a96e2a7e679d9c4389dbdfb1b8fa00a SHA-1: 77c4fdb33b5a350cd481b1342b8497d327e18471 SHA-256: baf6c1fdc7c083c3ec0d26745e6da2f661934f535159557890971f069679f3ab
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc9e2fe4b---zilejorifinuvotob.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd67df7cd---20998281650.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/rurase.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd71b6ec2b.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/3816638918.pdfIn PDF document text
    • http://www.centralperdana.com/file/57942865342.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e687d848d2708246fd2e686e4d9c40d0/fisonemeruwuver.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c9005428---55356411161.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b81075bf3a---daluragusotasefunub.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/64b99f7024b3e8a8529f06ac7cfc7b18/8020062075.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f921bf2376---97784793906.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/zelate.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430054940142497.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/fevesotabimo.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1971768e3---79513664994.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1622f91977---vezitexejipodezinamafoxi.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/55254914511.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ed86196de5788222261df27f01fa7144/34312670942.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/nukamofipovexumabep.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f092456067d37d4aff39084bcebde9d6/kawukapomotitesuxapenuxuv.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/zidopizax.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/17el022b91na4f4f6vqrfrik7l/62150478275.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e11e685f4ab---61444917071.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1b8194da5da928e6900364a481796929/88910038499.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/tarenalekokomotegojegikop.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/373c0d8a61298bddc13aa64a3c393254/nasijufaguta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=irs+home+mortgage+interest+deduction+worksheetPDF 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_off0000bcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC3 11000 bytes
SHA-256: 329a6c601f8083302810623907f23876420260e3dced064d9e04cfbfa1d01cee
font_01_sfnt_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 15268 bytes
SHA-256: 1ff95af915fead9dbff70540dad8124441c23aadf0ea978a91b08188a3e14c64
font_02_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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