Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9bc7858c581f30…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 08:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee1594114611aee070aeb2154e17fd1e SHA-1: d37b0756d077769262a24baade66675b36d6cfd5 SHA-256: ca9bc7858c581f3056dc67a3bb37df890f45ba9903be7aaf60ef10f3249d0868
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic and numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into revealing sensitive information or initiating fraudulent transactions. No scripts were extracted, but the document's structure and embedded links are designed to facilitate the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=android+browser+proxy PDF link annotation
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e38b020a6ad5ba634e9b3cc9428b1d26/28596172289.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ae23147fa31257a94e887f45bfb9ff18/61065698783.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/bofesajofibodugepet.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/8391430287.pdfIn PDF document text
    • http://vanhacollection.com/images/files/bisupubelebedoserusufuja.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/22117689004.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/662250c3671a2355204799dd0eec8f29/36661070477.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/13320997904.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/44864251690.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/46207039572.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/kavonadelaz.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109180136008599.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vugulub.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/jilukivarozo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16137199957ae0---zowufajogugoz.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407a0b375f8---dujizazakowofupabekadevi.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/rusiz.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210917211358788.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/vanezenegipabuse.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/74851000935.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/guragazavuxanoweguxinapin.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/bipiromenosebofawes.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/xafuxalefitoboxizufigon.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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 10500 bytes
SHA-256: f1ce48daae6484cfc453c6e3da2179cf3d51682abbe5eeb672cbfb72935ef937
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 17248 bytes
SHA-256: 7249f5b02932ac3f0fe96e3dec7e12e6f1fd280261669e638644d22340c92eb9
font_02_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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