Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5eb65d2f892d843…

MALICIOUS

PDF

118.6 KB Created: 2021-07-24 09:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a15b5d51a172fb6fb3017409bda937f SHA-1: 3c02f50490d66161d9d1dd5acdcb3563d0d79691 SHA-256: b5eb65d2f892d843f79302be45f6c78a2afa1680dcd4bdba86341769f48868e6
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of an IP address literal in a URI further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df051e0371b---50041888095.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/8hak05arlq2pt74pj2cdstdvcd/netafewog.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0825c8d90---pibemeronena.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/75782912915.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/28542601234.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/18832650789.pdfIn PDF document text
    • http://ciskmv.com/css/file/78512485586.pdfIn PDF document text
    • https://ivaco.it/file/41398729181.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/nurajize.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/vokojekupile.pdfIn PDF document text
    • https://superpart.com/files/xowezelomedutigojajegez.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vpo2vh87mc9k08elkft8nd3gpe/88677773751.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/galinoxiruwetatumumamomur.pdfIn PDF document text
    • http://greenld.com/userfiles/1834735963.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a08fd135957---rekevofitorabegofunozub.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d7311b69---68652174938.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0655303b7---34192668440.pdfPDF link annotation
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/857cc3ded39f9b02dc1410bb1f244023/dirabaj.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4c72dbe34beaec19bba3e67906aac580/91082767078.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/bovodanidajube.pdfIn PDF document text
    • http://abwva.com/uploads/files/51473163082.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/23721188145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mushoku+tensei+eris+and+rudeus+meet+againPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DA 17660 bytes
SHA-256: ea320467f12514c349200de82d6d4abcbba41812c6ee36cb7d62931a4e480854
font_01_sfnt_off00016ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA1 17356 bytes
SHA-256: 8f97fb1ce2114e227124673cc5930601ec7876664bbd2c8b528598bbfe9a8bcd
font_02_sfnt_off000199a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199A2 10832 bytes
SHA-256: 81a0cc0b51a63049c49c2244bf595ca5c449178797062b110866ac989387adb5
font_03_sfnt_off0001b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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