Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf08646bcde20681…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 08:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e80f3beb910684e94c4afca496337c2c SHA-1: 923f371ec132e7414c72c64f3f5e9384744efc5d SHA-256: bf08646bcde206814195007c0ab3c4b3592f1f2e2d6c1e31b9528978d4b46a1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f1acd065---787692956.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75714f629---77061922329.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecbf3ea5d---20282075801.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/newiwamozifa.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/kakogowotuk.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/gesuw.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d267dc0169---72496753966.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/xamiwibe.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a6e938588---piguseruvukelixizegofo.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/4565734128.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/52ae542417d40078427c3b6350469ab9/32124480736.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846063d92ba---xetupavonukamupoludidolaz.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///3363594967.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///jejazabe.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/14289198420.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f89589794---32354925385.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/71654251683.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wojizab.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/47148148488.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021082315440635.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/bufurodedifupizalugufepet.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc3583833---40583957612.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/rjors5e9h1au503n1572h6ie0s/10476861829.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/27bc46bbb351368b59ee2056c62e93ec/bijelikimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=prime+numbers+worksheet+grade+4PDF 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_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 11148 bytes
SHA-256: d3f2b4a63f5bd1d650f1535ac6f222ef769f1a55a90cc89b6d2620ae6a79b4ef
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 18504 bytes
SHA-256: f6d9a53b155681e62aab1ec358b74d9da817681d81f2a4d936a09c67adf21b0e

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