Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f150def55752fe…

MALICIOUS

PDF

82.0 KB Created: 2021-08-23 09:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b172251241a8e804a19c1fc4d458761 SHA-1: 4b60073ae9e93e9deae0173e43fc864a52847831 SHA-256: 89f150def55752feca35e7d401470e8a38754619fef055d0b11221409028a91b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, with the document body being unreadable binary data, suggesting it's not intended for user consumption but rather to exploit PDF vulnerabilities or host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://open-call.fr/uploaded/files/68826675363.pdf In PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/43e797cbac59de4e5e175e966c7d36cc/40959691120.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fepunisalofuseli.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/tikekebibuso.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210624043644.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/89655950635.pdfIn PDF document text
    • http://ccmyungsung.net/userData/board/file/59252220190.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/gavudofijoxenosegelibi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/demazixugixemivo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/sapufi.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1627295280.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/20888429110.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/366b73c03daf8094703528d8b29ff213/87501024634.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/xobutolixipimefur.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f64b046a8---35814065398.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/libomobuki.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/37642809697.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff1f06d6b---fazupamajubogigolado.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/32f503b129559fdc72e638e213cd1fad/luzimuzunekubagutuzozaxu.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/20376111709.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/56a6cfd6446fd2ac3b934273a197f6a6/26934682124.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dqv0cq2ec5hntcigjh31o7avg6/vawotamemufoburevitatawi.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/98491822242.pdfIn PDF document text
    • http://teplospectr.ru/images/files/33139789051.pdfIn PDF document text
    • https://temahr.hr/files/monuletuwotunosetufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+meaning+of+helplessPDF 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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 16592 bytes
SHA-256: 99ab238981b37df149240b1fd25f4a66ca643870d0fb0060be0ef0ed54099ef4
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10568 bytes
SHA-256: 74a7013a1be8157069427226bdbea7c9d4d873a5331cfb9a17ceff80a67eb3b1
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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