Malicious PDF — malware analysis report

Static analysis result for SHA-256 af098b16ad8f3016…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 12:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96202015fad02cc05113981ffae4b221 SHA-1: 98b45f9ac1e3a221e1662917964300e8596cb585 SHA-256: af098b16ad8f3016b9211d6d495bd91daa891ef84065128a32c813eacf31e4de
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing lure. The heuristics indicate it functions as a link farm, directing users to various domains, some of which appear to be compromised WordPress sites. The primary goal seems to be credential harvesting, as evidenced by the 'SE_MFA_LURE' heuristic, suggesting it attempts to steal one-time codes or MFA approvals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://crysiq.ru/uplcv?utm_term=money+cheat+gta+5+story+mode+ps4 PDF link annotation
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/70415739280.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614058f3201fd---fuwuwefozedixuw.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/1454472297.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/daweperijisigebikikemo.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/68367219356.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/71803627023.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/76800908529.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/mixoraxemebelebogazole.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/xijovavom.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/87856655742.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lbrm2i3rc63dmm4j3plgkofmrn/sowevukaxero.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/77032445074.pdfIn PDF document text
    • http://cissi.it/userfiles/files/gobona.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131489c4d097---85182285196.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/75645010407.pdfIn PDF document text
    • https://cityface.cz/res/file/33096280879.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/wufuguninazadamolaw.pdfIn PDF document text
    • https://viceda.com/userfiles/file/17665356784.pdfIn PDF document text
    • http://zimmerei-possert.at/gekidegomujifo.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/kiwegarilelozapoworosow.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/kotoreledasuduse.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/refegerixuvikevobuwuneka.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210916142735187.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/47163049767.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_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 17176 bytes
SHA-256: 231132ed3a3869eabfa2549ce4a901aa0e042795ef7a608fdb6ca435d87fa5e5
font_01_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 11140 bytes
SHA-256: 35b42f49111cafcf0870ea429f3628cf95837a4c47431559ba2b36c04a7dd9e3

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