Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0d84717c685474…

MALICIOUS

PDF

77.6 KB Created: 2021-06-29 06:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1085f75033b79ae9243e8c7927a831a1 SHA-1: d60e24a8ecbe8c19a94010f06733d0fe8d564982 SHA-256: ef0d84717c68547455923a22c4881825eff5bf34badbe11c3859b4c56f5351f8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs that point to external resources, with several hosted on compromised WordPress sites. The primary attack pattern involves luring users to click these links, potentially leading to further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://aire-limpio.com/img/editor/file/burel.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jf4mgmiahoqt7hqtjeka8jvgk0/kasovidowe.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/milukulelomaxebi.pdf
    • http://sns.hu/_user/file/65214621290.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/e4d1sh1csjqkjj14arab935ibm/xubopiwelekifa.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82a52ee7d---tukinejonodefalo.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/vekububovemepox.pdf
    • http://minicabii.com/survey/userfiles/files/77570898141.pdf
    • https://computerzone.pk/file/48889753537.pdf
    • http://asbufestival.com/uploads/FCK_files/file/48982077033.pdf
    • https://baoholaodong24.com/userfiles/file/73151358833.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb0667bba---nojepomazusimagelimulin.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/gqcunulm004h49qp77j3vkq3v5/55527834289.pdf
    • http://modamoda.nl/uploads/pic_lib/file/tatisegudalusapefoga.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/reparigafupoxuxoza.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3ae6c7dd---wudap.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e9914f83b---53688496312.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607927cdbf07e---66986672588.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b513edb24---mapejaki.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a0188af91c861a26f98ae839eb9eb0a5/2979161033.pdf
    • https://atcotourismtravel.com/userfiles/file/bizalikalerisofixagilo.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878a7bbf8c4---wewujibut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=101+conversations+in+simple+english+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_off0000cb27.bin
bc72cab563bd49bede310fca719a4861ef19cc38bab9ccefd7780901cf9939a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 17084 bytes
font_01_sfnt_off0000f75f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 16792 bytes
font_02_sfnt_off00010f76.bin
bf2fb5dddb2d187aba16a132466a1f3e9ca172ea9364b65256d0d50f06c15bf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 11208 bytes