Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab16606a40c48164…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 09:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a9fbfd1835aa3cc04f9b60b8a2f60ab SHA-1: 6b489c4f0071459d44a4d89d4be2df5df2b4d1ee SHA-256: ab16606a40c4816453fd726a5b37ef2ec6f33c9b195d2198b02f919a2c33eb6a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document is designed to trick users into changing payment details, a common tactic in business email compromise schemes. The numerous embedded URLs pointing to compromised WordPress sites and disposable hosting further support this, likely serving as part of a link farm to obscure the ultimate destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608667959028d---91555066598.pdf In PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3bf825c289d90497b5f4a14e3b794bb7/39232777536.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/gazoxidajagisubirizebi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1087d3630af7c574500d3a449ead7803/31642772681.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/tofelitux.pdfIn PDF document text
    • http://raczcsalad.hu/files/95750308156.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9cnhdugo9flnfbcdokgehf8i67/65436916386.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/df99c707b3c1ed5f01a80e50fe001ff6/katutotekew.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c4f3b51d9---81133121677.pdfIn PDF document text
    • https://peterdegendt.be/file/wafosovodep.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2622e99df2---57353369743.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27bcd4fe5---wiwimid.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a135831d0fa---65905147402.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/13b9f326f70a6135c6437288f1024919/33820937589.pdfIn PDF document text
    • http://fini.hu/userfiles/file/nuxovurukupenupumirazuv.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/76556400517.pdfIn PDF document text
    • http://bankerz.in/qpic/files/fosisuxuzonugu.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/77691294849.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/susixerubeboguzakuze.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081836f69347---13893234642.pdfIn PDF document text
    • http://ore-processing.ru/d/files/rizumeruga.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/pekugozokonikezu.pdfIn PDF document text
    • https://hirurgija.me//files/13638947533.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d8ce38764e7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=401k+loan+for+home+down+paymentPDF 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_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 10952 bytes
SHA-256: 2df4b31db9e9b4dfb6f054fb938615a951be45d2d0f42541a7be048b6ba8c611
font_01_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 18196 bytes
SHA-256: e4c439f4eb9bbf3c2e8e8e9da4f5aa571e394f073a31a231e3c562a15a8f51c3

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