Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc28d7bd85eecb8…

MALICIOUS

PDF

84.1 KB Created: 2021-07-10 11:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b1235ca79e3cded96d4789f8dcea2261 SHA-1: 86adda622660fe60f8f4d2b2bc169af2e5c466f2 SHA-256: 4fc28d7bd85eecb88721695cbf9d42a027a9fd94cb159da80577f860432d3eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external URIs and link farm patterns, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan variant. The primary function appears to be distributing malicious links rather than delivering a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://chcial.ru/uplcv?utm_term=automatic+citing+website PDF link annotation
    • http://gleneaglehoa.org/images/file/kokimawobegamuwurajotul.pdfIn PDF document text
    • https://luminex.pl/upload/file/wijebasafupidelufuruvevuw.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/pajabafisebutenagiwabeso.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/delj8pl1ld085sitmr55ics303/61921008571.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/fazavawosawenesikidejewu.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/megufibezixesak.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/mosodemew.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ffcjsjfhpbkkk1f3na5g9q958d/46929836632.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/30453787201.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210609_AAE1994FE6D3BF71.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/3526698358.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/72395563266.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891889f424---fowaxixol.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf3a87407---56551534859.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e62422dd4cdee32ecb070723a41f6c2a/mukupubigaf.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/wudorapodoguvovutezobop.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1m13em7c2quiac3afb70hqo2s6/47486857864.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7f66483e---36351742092.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/505bb90e2db017ad01fb70be5ab7b603/54548860267.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/45236866424.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/dedomedisezi.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/limep.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/60291327909.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/rjobkfbk9p6dudnhp3rtotjbe1/92522997389.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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 10736 bytes
SHA-256: 722597abbbc83cebcac1e66534cb2004cbcd4a44c88850032e80c6af89c0b00e
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16804 bytes
SHA-256: 79caf7c5b2067eb541b387491f7ce35c23b9d24cd26e128f6d552bca4624e98e
font_02_sfnt_off00012b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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