Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5c97b44cac4367…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 03:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ac8cab89aee1fd3ec487b8066b32e42 SHA-1: 6748a16fd379a6504fe666638ca0449170505445 SHA-256: cf5c97b44cac4367b58673f5f88ed0b5d8641e55ffb74e9fb718af4af00141c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the URLs and the heuristic findings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/122411282791a29bc3294bc989ff3bb5/jabag.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/771ir8knt2g4us2o5lg7tfrgkd/70407417782.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/27583750406.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/wovet.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/fikeronoxizi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9ec92e41---tugapukigukatedox.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afda58d9bae---muredizeputufixixenun.pdfIn PDF document text
    • https://bloomeng.com/uploads/20797945959.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/voxemevebaralopas.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/jss4mu7hdnuhforcab61m7too6/fawona.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210605_A5F6F148C4E4A0C9.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/zilizapi.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/27346441070.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/094c7bd8e41cde378c70f6e8bcbedc57/wuvadekomalewaxisosup.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/4edfe662de1b7739d3686ac238c7a208/tagagomapimepavovesu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dj3n8hb3lqv7e90ku5cqojhpt8/69816747930.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/10845725730.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/78458935525.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160864cbc9783d---27180124171.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706ffabdc7b---suzaxidebujutekixusajeve.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/okc1cigulk4i69k9bbrukn1ngu/8178313630.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608050714409a---zotibikijeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lowercase+alphabet+tracing+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 17988 bytes
SHA-256: 507319ae9a39a7381e9ce28d5f62df4d1418d2c27fe265906f563a2c1a88759e
font_01_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 11084 bytes
SHA-256: ee943cbfc80954f0d9e01a36e66bd874f37f817f7c1763daefd284340a95aef1

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