Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb56b141347eee0…

MALICIOUS

PDF

71.9 KB Created: 2021-06-26 21:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5fe49f5a8c3163d2250bbdc58a88bc5 SHA-1: 6c76f129b01d411c0a799921b952d82d125f0d93 SHA-256: acb56b141347eee073ff4727559da05b6210c3f0a1d9a56b071d2e4694245040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories. The embedded URLs, such as http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c407432fb---guguzotopome.pdf, are likely used to host or redirect to malicious content. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea501eb385---salipaxilokexejewux.pdf In PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9dcbfb59007439a8e9352ce0cc15cde6/2404933872.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b569bc5645d---43773287339.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/87926884471.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de32e4cb54---63752813920.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jrt7b89ibik3c140ei9c4llfak/88461656071.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c407432fb---guguzotopome.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/34949656037.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/178e3030c40fc6bb6d3281fc8cf6b5de/simemugazawufuluk.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c0b217b88a385f3691b310da4006526b/sogosatitavapukimigoga.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/42117060902.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160859673df1c8---fazemesej.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jopawusolid.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wegisanejufapoz.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/debijawipirikiwovilerob.pdfIn PDF document text
    • https://luminex.pl/upload/file/bigererinanozobubed.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087aefeb5395---penemiperotuvozuruxadurel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+the+westPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB968 10428 bytes
SHA-256: 75d815c1687005767ccb3b072f0e377a6f15969d991f538bfd5d5ba1dd6efdac
font_01_sfnt_off0000d111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 16616 bytes
SHA-256: 684a84524a7faebb45f58a666c2db30a29c2d8eb0a037c3fc9434a8aef8263f9

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