Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22a8e0c3e4b59df…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 01:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f742b80afb55565819ebce80e82e5e55 SHA-1: 3b67a72844ce0a37d0ce94ff09ec59bab694ff1c SHA-256: a22a8e0c3e4b59df76b87564f27424aaeb38e8619928bb8dccbc3aa1ee1b99e7
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of an IP address literal in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://barbusci.it/maisUserFile/file/galawepariterokaxa.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3aa829065---jexig.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/944e667736108019fedafcc7ce439c57/57699226852.pdf
    • http://evohome.pl/userfiles/file/waxeropujapawe.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/74902004712.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8541cfed56bfbd633e5fa683a45a9b2f/83407370730.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3228bad0a6ae9fd8bae1c00a05d76757/bomoturemuv.pdf
    • http://marty-triple-m.ch/inhalt/files/vapuxetokakebudinas.pdf
    • http://kalmi.ru/upfiles/files/83291726483.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/gawamumuwidanitota.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609219f27c413---59528603346.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/u1r4696c7j3cskf04pk3aj64l0/62874137255.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/97eaeb6cbe4188f3161fed0f0811ffe2/9860607927.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee4a2d3e9---sudutupusuligukududavuwot.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/petab.pdf
    • https://chmelo.hu/sites/default/files/file/jawibodolu.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/7baba258fdf6f8086405128e102b644e/ginimuvugeduxuvifubir.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076354f614a5---611983727.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mvn80h28uosb0l951i9u49e5g3/nezatagemenetaxukot.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/rrvfsarta1cjvsu15dhs80ljc5/toxejenowuwege.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16240167352255.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0936fdc8---tavubawute.pdf
    • http://madmojo.com/fckupload/file/danafob.pdf
    • http://blbr365.com/userfiles/file/1624492207.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744c05ea8d9---biwavajinivazezobekadupor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=p90x2+fitness+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_off0000ee72.bin
5930e05ececbadae9f08a0d68288529a6b700728126d9de5fe0758b905e5e9da
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 10856 bytes
font_01_sfnt_off00010789.bin
825e2dd7ee23e72b1f8b4b79685f807e7489b17f66acd7160a53f19cd0c9ef8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 18332 bytes
font_02_sfnt_off0001380a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 16792 bytes