Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5383c92e4d37a21…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 12:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5045882cf1a465e50a980113a848563 SHA-1: 1c2421be153396d05b92e08bf92486a4274bc6db SHA-256: e5383c92e4d37a21eb8a026e6536edaf92b419622715dfc3a134fc1fdc8d229a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a57a3dba04481683c6f3e2da811405f0/sodajora.pdf
    • http://rwdwebwebdesign.com/img-aim/files/51515180188.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4b45f6dde3f2005000951b63b43c5425/48899333061.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/siwuwapanosup.pdf
    • https://powermailer.in/userfiles/file/58096647891.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1015d281d5279d26cfede5e3cf84970c/majobemugegoxi.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0428e542bf---xuxufijiduzegokududimu.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d2be1658c56e960d4618fe0814f66fdf/637978277.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a612b544c32---xalujumugejalanivopax.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/tekigufunitapinixapozaxo.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8158e4e1bb---polutarekezixegosewu.pdf
    • http://chothuethietbi.info/img/files/nonudobarivujene.pdf
    • http://krakow4you.pl/krakow/files/wenojegugedirotopavivom.pdf
    • http://j-line.ca/fck_upload/file/pilisirubezom.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9de5be9bc---1221450079.pdf
    • http://alrabbancapital.com/file/files/fupomazutemiwab.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc792e6afa9---29978790936.pdf
    • https://airflow-skateboards.com/upload/file/81821982802.pdf
    • http://bigband-ulm.de/userfiles/files/rurekewi.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48a3de698---xadadajesisakifuranusofek.pdf
    • http://rymwid-training.com/userfiles/file/dajatinoxibuvebobalegutab.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9cec79e52---34036220383.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/qa0omiaci7vbcp9bs391vh7c69/60708129204.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b258649efd8---39461687892.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=real+analysis+and+foundations+krantz+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_off0000e986.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 16792 bytes
font_01_sfnt_off0001019d.bin
36960c6a66e018f65cd174cf2149519437738987858712fa769ef08968dee662
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 10900 bytes
font_02_sfnt_off00011b08.bin
eeaf1d0d036e0a4f86cf9118fbd3560bf814a75fd603a35733ddb0bcd4208863
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 16664 bytes