Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c52e60922449e35…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 10:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 669c7b889eca77011751527622aab331 SHA-1: 7f37d19113a6039ae0feea154b473cce809905cb SHA-256: 5c52e60922449e3524b1a243393536912c6030b98f5f763c8613756c4d603911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to direct users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=katzung+pdf+download
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/58pid4hnsvdfpfei123dh17q6l/simisesudedabitoxobitil.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/womefudukukuxu.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22824210110.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fde8c13da---lubitawuguvenijekabuvi.pdf
    • http://tetobox-budapest.hu/uploads/files/retafifevibufolo.pdf
    • https://alkathirilaw.com/userfiles/files/vexikelor.pdf
    • https://ph789.com/pinhsuan/files/file/sovosijozalizatamodanox.pdf
    • http://bluelakehomestay.com/uploads/image/files/kijepusejupumikanid.pdf
    • https://audit-advisers.com/userfiles/file/tazizevasonese.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/57163633634.pdf
    • http://lmnn.ru/userfiles/file/xevakugosewodonanozerep.pdf
    • http://soluzionebenessere.eu/userfiles/files/jafopafenusavoko.pdf
    • http://standdominica.org/files/files/52237161746.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f8e03e811451d4b595adba2943b305e5/5998965010.pdf
    • http://architettorobertafasola.eu/userfiles/files/88709680857.pdf
    • http://motolargo.pl/userfiles/file/29899436655.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/59214691868.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132999e3c6f9---jubesiledajoxizot.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168b4910ec---96664647249.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q5l2eh6qeeb7tubm71cqabb0ij/xefuzi.pdf
    • http://labsshop.com/d/files/38274224163.pdf
    • https://e-room.co/userfiles/file/tugosubujamipipudexa.pdf
    • http://librojuridico.com/aym_images/files/foraxemigupelomed.pdf
    • https://merlak.ru/userfiles/file/tupumuwuzasirirav.pdf
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xexifizotigogozuzojamorog.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_off0000dbac.bin
01753c126dd8e07c7053f10d284496a89f092f199a9dc0721741ed5b592d807e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 10416 bytes
font_01_sfnt_off0000f34c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16792 bytes
font_02_sfnt_off00010b5e.bin
a39100579c7fb41502af3a59ade7b306ae378ab41ae7a594e7274720cbb050e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 18276 bytes