Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f12e609a7ec5d0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 09:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 26dbc24080dc8e94e84671840a33f2ad SHA-1: 4b4689c8c6d352f5b1a314f99eed29eafdec234a SHA-256: 88f12e609a7ec5d0a6d05324f8f41786f26fc1983d3772eca8e9dc76ecc3f756
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1190 Exploit Public-Facing Application

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of credential phishing. It employs lures related to MFA confirmation or callback requests for billing/security issues, aiming to harvest user credentials or session tokens. The document also contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a link farm or redirection mechanism to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=free+premium+tlauncher+account PDF link annotation
    • http://intproplaw.com/admin/uploads/file/koxafebuzumijunafunanel.pdfIn PDF document text
    • http://chipgene.com/image/files/20210915_114743.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a497685f---25557045169.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/48280950728.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/revipozon.pdfIn PDF document text
    • http://webbuilders.com/files/file/60856851046.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/89231982459.pdfIn PDF document text
    • https://melz-feu.ru/upload/nigazesu.pdfIn PDF document text
    • http://axwelindia.com/uploads/kuwomusejigefipovak.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/94465749164.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/38693852150.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/kajebokujalawexap.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613835134d5cb---33167051067.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26e4f1eff---24574122622.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/22036538993.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/rozegopolepifaziruka.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/78234335450.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/xigove.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614285f398215---zizafugo.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/pujulosepobuzimepefi.pdfIn PDF document text
    • http://muszempilla.com/files/file/73381972202.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/78985183513.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_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 10548 bytes
SHA-256: b279ca89e86e407fded6931346975d1f8463c7f49cc4eb16a5b06965cabc63a9
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 17576 bytes
SHA-256: 00eeb28034cccd133f31c28d887fa420c5a62dfaa690ca91b65ef1ee795634d0
font_02_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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