Malicious PDF — malware analysis report

Static analysis result for SHA-256 987b16ec96be9c6c…

MALICIOUS

PDF

74.5 KB Created: 2021-06-27 00:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4db4c6426628645f63e498261a05e596 SHA-1: 3ff43577849bb49f5193162849b6fe2d44831d71 SHA-256: 987b16ec96be9c6c2a816d7e53e16b1312ed1b2629e1ff05d8d6934295fd79ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress installations. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, and the PDF structure suggests it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160849538973bd---rukojexovaxezibudelozetiw.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3688db4c---12389739561.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/47784327482.pdf
    • http://korean-school.hu/hangul/userfiles/file/21430343914.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ij3nfrrmeiiv2ashf2nejfqc4g/37788948824.pdf
    • https://festival.bg/fckeditorfiles/file/92239696481.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dddb7e75d---vutuzujipirebovola.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda089a5a4---60630223869.pdf
    • http://nedirajtebosnu.net/userfiles/file/202018095.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079890d78a1f---benodepizakimim.pdf
    • http://cn-junsheng.com/upload/file///20216903017474.pdf
    • https://ancoraeducacion.com/images/59339918011.pdf
    • https://limsurempat.com/contents//files/pabogojubumozupusala.pdf
    • https://luyenthitoeic.info/userfiles/file/81038247404.pdf
    • http://remaining-mc.de/userfiles/file/vatuviwa.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7aa4a6ff---14281736237.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d4928301f171b39b27a264ac31a03c15/pemaropivik.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722df54905c---30655859799.pdf
    • http://mdc.ir/ckfinder/userfiles/files/51344234375.pdf
    • https://tlproduct.com/userfiles/file/95764436101.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160921543850da---16098867157.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a594661600d---69899110756.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160974f0ba346d---25913177166.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21c04a490a---mumedo.pdf
    • http://urjabatteries.in/userfiles/file/gorixululi.pdf
    • http://itfind.ru/uploads/file/47883092177.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=igcse+ict+study+and+revision+guide+pdf
    • 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_off0000c163.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 16792 bytes
font_01_sfnt_off0000d975.bin
7b6bfce38191bcf279c1d07a8ff1067110dc8ced99dc74ab4f98308532719593
pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 16044 bytes
font_02_sfnt_off000102f9.bin
96dc74b34420ed8132a9216888b01c59c739580a97c14ae6e666c7ffea643f53
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 10980 bytes