Malicious PDF — malware analysis report

Static analysis result for SHA-256 b595be32fe6660ff…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 10:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce70ff35e196148d824db067f7fc272d SHA-1: f87dc71f6b54587596913426eee1fde74a22deeb SHA-256: b595be32fe6660ff61b18db296c97b7a4af968909eadcef99f39f16255cfd95f
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 a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or 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 0.9987

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://drafthe.ru/uplcv?utm_term=serving+out+of+state+subpoena PDF link annotation
    • https://wickedcheesy.com/images/file/pifunularibe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fcb584ab3---84715585583.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/98628957069.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/bujosage.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/wugoleluloxofazukod.pdfIn PDF document text
    • http://quinta.cl/upload/files/44370979422.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c1c5175e4---941789071.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/zabikezemowisumofaw.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jajigunukusetubudidosu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff87429ac3---24404043313.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/r3puljgcafjokottkr89c60n07/zosafifufetet.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/fikitanewiku.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/24213084500.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ff203939b45---54123253627.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/13616798715.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/97170579272.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ebd60837dfe74737af4f69284ccef768/3434674002.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7149945e83a8c2b984db76a244f89b3d/65519154344.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/69064185268.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1eb0b998a5a08aeeab1341078da3d2a5/58205605026.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/bfca0eb63229539ac316670de1063088/74859793412.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/25147817711.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/72805757611.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/88ecrlhviiujb44ijpq5vhjg17/fomegenoxesik.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ac5a6e3d3---fupevebatatefetufi.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 17668 bytes
SHA-256: 1a71e50adc7f129ecb0ae7efa2e775466045d94c6b1d23f2811691fc99a492c8
font_01_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 10868 bytes
SHA-256: a7f2419925d10bf1f4a6b9781d44f1738321b20d1ef76390a5aca02eac8b0f19
font_02_sfnt_off000125d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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