Malicious PDF — malware analysis report

Static analysis result for SHA-256 03caf94245adde5b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 16:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46db54d4c469b8bae2f77c23f146bc91 SHA-1: c5a921789af899847d625b933a42df499d2dc48b SHA-256: 03caf94245adde5b4d4af5bfdca006c6876697ae1e84d7b11a0864ae58e7d04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure itself is also indicative of a link farm designed to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=jantung+dan+peredaran+darah+pdf PDF link annotation
    • https://letstravelforacause.com/miet/assets/files/lupabajotelamafojaxaja.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/918967ca4ab0d4a739ab3a959cd6e750/86632579749.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c3692fda829---62735587865.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/57336251513.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c385f29146---41584453694.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/52333151122.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/kopatemurukine.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r0vbqlqcve439h0lof86h293tr/99062133391.pdfIn PDF document text
    • https://bem-sa.com/img/file/65574121534.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9d3b0fcd557ca68dcbcadcd90fb8c122/97469127707.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/sotikotiruligobepiwenoz.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/rulipugupenotedufodela.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc42910b96---7309573304.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/gevadujiresinasovo.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9fb496c62ba91977d1eb95941e2de8d1/81005425514.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/55200211852.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/27495283531.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc834308c5---lerej.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/50498418368.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/45526814665.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b1f7ab27---14647224677.pdfIn PDF document text
    • https://iohrp.org/f_files/files/xizevedowerepan.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/88569811992.pdfIn PDF document text
    • https://kermanrooz.com/img/files/ronijiduxuti.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca6875c8e---50990912196.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f08909064a---xorus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074058e3527b---64857839394.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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 17760 bytes
SHA-256: 437c7560b3d1730a06e6b6d9c916fb1aee44a11b737f32280f3b1ae065dc8a9b
font_01_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 10444 bytes
SHA-256: 179d9d7d018aafeeac84c2fa3c38c542542036f423aef01f5648d43bd40787c8
font_02_sfnt_off000130e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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