Malicious PDF — malware analysis report

Static analysis result for SHA-256 939885bebe7fc4e0…

MALICIOUS

PDF

84.3 KB Created: 2021-07-01 16:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f4b50b5db6e90ecf3aefe594f29577b SHA-1: d69a6752d1ac46ea0d7c032cde02271e5232e577 SHA-256: 939885bebe7fc4e0fd79d33595818695db6f9153a3a4ba005f8b1577f57d4383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The presence of numerous unknown URLs indicates potential redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 http://zeguvietnam.com/uploads/ckfinder/files/54192593958.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a97c2604---38945564121.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hjg6rllr7lrqlnunaesr5qfsrk/74368929353.pdf
    • https://digireg.cn/upload/xovurinukolezelumeraj.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/tigum.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/81029408048.pdf
    • http://brilspa.ro/userfiles/file///momolugudokolulibeda.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/07623529a2bc51e36764f92e00dbae7f/39944162611.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c915e26eb20---6659810618.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/2451805787.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2455e42ee---doxemudazimudepirinubuvi.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/8d9s8742ou8of11m3rf227g6b6/zazawijowaxa.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9t42e5c2j202mr5tflc3u8cotu/jilazasowoxux.pdf
    • http://fenotropil.ru/userfiles/file/vivajopip.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/120923c25192d25fac21f07651e42ba0/62778692929.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0a559bc7---13460412368.pdf
    • http://whatdwellswithin.com/file/61995903606.pdf
    • http://tutek.eu/userfiles/file/18607860634.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=a3+problem+solving+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5bb.bin
e7d3acfa79c621c3ad099d246e0a8f6fcb12db34f2d37f9333aaf0fd7b0e78f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 10956 bytes
font_01_sfnt_off0000fef9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 16792 bytes
font_02_sfnt_off0001170b.bin
10dcbc4ea35d9b1ceb09d8daf50615f8aa933089c2f970666afcbcd85866b6a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 16824 bytes

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