Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e840ba9fc8a4e3…

MALICIOUS

PDF

110.4 KB Created: 2021-06-30 16:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5e8363ca1fda7e59d3ab1de0616f4cf SHA-1: 35b4874ac37963231f1bb31e8d0dd7f8215c860d SHA-256: a7e840ba9fc8a4e3e51673ce9259e149d957422402d28d7b69d1b5966911be2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://aartipalette.com/userfiles/file/24212909152.pdf
    • http://abacusnancy.com/userfiles/file/2730511772.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6d74c25f9fc672abfc13fec4f3fc5a9f/14868346438.pdf
    • https://asthasupermarket.com/userfiles/file/jevoxivep.pdf
    • http://linkingpeople.info/userfiles/file/65916579013.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d3602e29711dc5e38a169ff783af5f4a/dipik.pdf
    • http://aeronautike.com/userfiles/file/84323711042.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5928d346---58364562658.pdf
    • http://hpworld.hu/data/pic/Image/file/nefur.pdf
    • http://rolmech-strzelno.pl/Upload/file/jawuwisudox.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c28c0963af98c29e777ee8f685c802b9/57855035402.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/730b6ae0ea5f431442c19eb925fe7866/lujutage.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9d4c5c88a1151322a9aec642c511bebd/6660729921.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/ramigalubene.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091832c8a90a---91149460481.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ieg9bolu1kusvu74tshgms42ha/59206931698.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765b22e39df---fudefejuleluzer.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5850d5e3f---libawumum.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a20e51d9---fugovilikonipixikipaxep.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f4080b33---gubunoropel.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/39s16l8kfdgo36976qtorb19t7/90281034624.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/869ce53a896df943bd1f9c68be08f2bb/tadivowif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=feta+cheese+and+spinach
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011475.bin
b8df30161ff2e800e66980efcd695eaf0ec04e8f63611febc286af8819f1f0d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 29984 bytes
font_01_sfnt_off00015ea4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA4 16792 bytes
font_02_sfnt_off000176bb.bin
f7760cb21ece7d15ec129af4cacffb9bf51d5bfaf0ba92cdd411a4d6a1e80821
pdf-font-stream PDF embedded font (sfnt) at offset 0x176BB 10320 bytes
font_03_sfnt_off00018de5.bin
908ba13514ce6eee20a04a00ff28d39e4fab6e1ae5fef8a9134d33a7befa4013
pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE5 18420 bytes