Malicious PDF — malware analysis report

Static analysis result for SHA-256 3409e4b83f41b348…

MALICIOUS

PDF

90.0 KB Created: 2021-08-30 02:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b044eb3b900ba46707a693db6e3fe134 SHA-1: 517e8798c155ca62cd819f9165c12dec066ed275 SHA-256: 3409e4b83f41b3489f0d3ffe715289b4c4766c6691f324c7b3eb8ade00068fd6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to external content, some of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to click these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mszukam.pl/dat//file/soketizigapemalopaja.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/58ca9024f08a5df1867cdb4e112a2c02/xilumoz.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051919062073499.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2a32bde6572c72e0b33067904342ade5/mukumikejimagofaxami.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/59394151153.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/dufadigoj.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/sadegaxigora.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/88128716232.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/98098296183.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/51047852991.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/zitoxujasusevek.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/zusodalerojogim.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/towolowejipemofaz.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ceebded8---31595329573.pdfIn PDF document text
    • http://jn-zhsc.com/upload/zemep.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5617c57ee---siganosewo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a52376e6afe2026d87adce5e944851e4/8285975257.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8ea50307f5662be730fb22b123c1d579/42107763029.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/numutadosowivakuvalikazuf.pdfIn PDF document text
    • http://myredm.ru/uploads/file/90687546625.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/2995348387.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/fizetu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d51bdd941---gosugojivurulimedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=elements+of+communication+situationPDF 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_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 10480 bytes
SHA-256: d3602dd8ba357cf7c9e4e90abd44780cbaa1e0c58522b47c235392974ba4f96a
font_01_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 18512 bytes
SHA-256: 8d5271d2de513211f032ec9bbd0ec269d0af989e5eba93b8cde82db3f88171af
font_02_sfnt_off0001428b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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