Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e81bad90ce60a0a…

MALICIOUS

PDF

91.1 KB Created: 2021-07-09 20:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ae84021870c4e9b15d7d010d1f1b477 SHA-1: 4766997dab277070b5deec0d81c117ae9d21d081 SHA-256: 4e81bad90ce60a0a0d8222fb76b5e35d84edf26b8545c3921987ba11dd73cf9a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a43659c408b---suwuralaxowesazazukomer.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f36aa7c35a---65866179470.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2487fae683---10308678323.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/74341204176.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a7ee986a9771b6d3adb6c70abe79a9c9/konajazuxepi.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/medanemanedobetukedu.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608681a1cc442---12222910751.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/lozefidagelumowugol.pdf
    • http://aihyang.com/userfiles/file/xupawedebezonitat.pdf
    • http://www.zywawiara.pl/pliki/64625564852.pdf
    • https://autoroman-service.ro/imagini_ws/zewopanes.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6cbc6cbc435dd6d8f308d5de2b5ebe02/bifidopapu.pdf
    • http://aloeverajuice.cz/files/file/kumufof.pdf
    • http://sinhorelli.com/userfiles/file/wixexowe.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7898096b0337075e80c75354ce2e3dd7/67231034122.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1gskqdb5m2t2urh74kigfehvrk/75577782305.pdf
    • http://tano-cable.com/d/files/40453744660.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/eg0v9302dagbhufh828mjllss0/fezaputojuxagu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=why+are+you+leaving+your+current+position+best+answer
    • 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_off00010194.bin
1db7de60c01e551d9a955b49c67540b9ac478fafce4a717374c6bf953ab43672
pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 16824 bytes
font_01_sfnt_off00012d46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 16792 bytes
font_02_sfnt_off0001455d.bin
c99c0dc847b71a2aba66d0e20362920148add7970e960d2d5c7d4d9b7a4ca80b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1455D 11152 bytes