Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a197047d0d8630e…

MALICIOUS

PDF

74.9 KB Created: 2021-09-27 22:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcf0e51187ca0b997077941ebf76b532 SHA-1: d07f9189cc8eea7ef6bf7f88af8085a450461161 SHA-256: 8a197047d0d8630e2134feb4f6ae4118505165d599aa52f7a9f20e3adc3585ea
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. Although no scripts were explicitly extracted, the presence of numerous embedded URLs pointing to potentially compromised or disposable hosting services reinforces the malicious intent, likely to host further malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • 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://medvor.ru/uplcv?utm_term=u+launcher+pro+apk+download PDF link annotation
    • http://alarcon-v.com/editor_upload_image/file/62004141758.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a9e9801f---69430167506.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/fizovibabuvewapi.pdfIn PDF document text
    • https://dacola.com/upload/files/vizunu.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/64085548872.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/67028765718.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/mujopejabagepabuko.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/zodoxiwafojakeku.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/mafug.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/dogulajixevaj.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/nurem.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/99896129491.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142f7264493d---robam.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/tubofakamawuz.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/rokidutopalepel.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/66284472065.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/57186748701.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4a011bff---votononisobufibupenilana.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/kibamudefipefu.pdfIn PDF document text
    • http://kgmda.com/upload/files/54615314599.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/adf34e326df4d0cc22d53a2fa0375464/33190807776.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210917_005900.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/9589170398.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zuguzafixikikejutixijiwap.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/64587531927.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd188815b6---kenejuwakezirudi.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/devesudinudirozuw.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0aebc11f44b243831a0605f57bb874af/wamufiwazirizodi.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_off0000bbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDB 10540 bytes
SHA-256: 66cfeebd59e591d33e8f2d5ae9cc5d54429d3801659806622e828a83260fce85
font_01_sfnt_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 18480 bytes
SHA-256: b9f7dd8dbe396d372821e996649e45719871eaf0ce93931047b929c31ea01f04

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