Malicious PDF — malware analysis report

Static analysis result for SHA-256 c054ddb88325b138…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 14:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4840f94215d069fad13cf93f38d8344 SHA-1: 174c84d7378097b602c02fca05282446cc0c0b4b SHA-256: c054ddb88325b138e0d8adffcd15db7e6e7048164dcce3ffe54376e96b9cb21a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=opinion+writing+transition+words+pdf PDF link annotation
    • http://wohingltd.com/userfiles/lijido.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/lunifewemed.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/40674794298.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0290cd4f---88286307563.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/66794200449.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/gokobimejo.pdfIn PDF document text
    • http://ellev.fr/upload/files/vojofeda.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/73100949427.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/kakujadumafiwidalupelil.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade02cdaa---1103846409.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/iiep7b682eepqq280vgmhssgbs/31642219081.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd42268413---38637961314.pdfIn PDF document text
    • http://kleiberit.ru/files/file/10809521166.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/68376824757.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/melunavibuseg.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/51280678950.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/godujirumijigiwezonoritu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864588c5011---3340123694.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/sijezitudofenefakan.pdfIn PDF document text
    • http://slsnn.ru/content/files/20078635790.pdfIn PDF document text
    • http://bscartridge.com/pic/80261705539.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hnqlbaqo279j88anrd0a74a4jl/xipejikenazitanipawukepit.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/10686411957.pdfIn PDF document text
    • 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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 18072 bytes
SHA-256: 6954cd42e7066f5e90c4d75b3d6d71beb18ec48153aad26fc9748284111b8c95
font_01_sfnt_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 10604 bytes
SHA-256: 254220feb7634c7da325ee9a00d539862b490e0042de489185f3c6e830af7622
font_02_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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