Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffb07e1d5139994…

MALICIOUS

PDF

83.4 KB Created: 2021-06-26 10:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e745d9c11c42be9b67f9b10a7cc8c7ab SHA-1: af92acb9b0bb63d4c7ab12006abcb5c8082df9a8 SHA-256: 2ffb07e1d5139994951c54c7961ba45aa3dacc18692946112d999e87b6984c60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised upload paths and disposable hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/fnhnju7tpevobrefpvvvvt5782/48968508602.pdf
    • http://romanakladatelstvi.cz/userfiles/file/74037358253.pdf
    • http://driver-jazda.pl/upload/file/29654999054.pdf
    • http://on-video.com/movies/movie_data/file/58419911644.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6a68e41e8---47421809003.pdf
    • https://organicfertilizerproduction.com/d/files/97914769794.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f13ba8c0b---69254895038.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vfgqdjf0psitfvtudqi0bli13v/78039436163.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/tinovobowumazonugofukavu.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/unk1qi4ul6n7di09fbj5mj4kri/fanunel.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/9761738695.pdf
    • http://superplasticizer.cn/d/files/zidepulebizigowibupusud.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608244576bffe---desokadosezajubuwiza.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc71feb3f36---sovoborudujixalebozetavif.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/159c0c172b92dbb74c601cb8f4d5bb91/6154342391.pdf
    • http://bettaletroom.com/file_media/file_image/file/86254176075.pdf
    • http://thedigitalscorecard.com/userfiles/files/digabojoxopidonemowupulug.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc408d85c4---53308161036.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffdf79371---16412604014.pdf
    • http://stauarchitetti.eu/userfiles/files/begesoga.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb9d6cf4d---89495267597.pdf
    • http://apexnepaltravel.com/userfiles/file/sogidojugoteku.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ae69f713650e1d6565892af11b2f94a6/jiweropifa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=possessive+adjectives+uses
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e442.bin
acb91bfbd9e2aae7a51fa690d33031b3d3d5c9b3193b408f745a576863a89cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 17540 bytes
font_01_sfnt_off000110d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 16792 bytes
font_02_sfnt_off000128f0.bin
29c4628772d33f98c05f15cc536e0007b78e586f0a45bc9d8424122b84b42873
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 10412 bytes