Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e27561e6375d85…

MALICIOUS

PDF

98.9 KB Created: 2021-08-21 00:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2d03a1bcc61ee879569d3f513182085f SHA-1: 70267d005af4b398a4093f73467a036db48cab70 SHA-256: 58e27561e6375d853f4bb9170d75ce5fa848d78033e8c57c6fc31de687cebe6f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hoteldarim.ir/basefile/hoteldarimir/files/rifaletadalilelexubav.pdf In PDF document text
    • http://sostrevalli.it/userfiles/files/belurigizigiv.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/50459373633.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f598f532e7---56092050698.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/55338989456.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3e7f46335d86c3eaf6f377bd57895489/62832510832.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/vewajuvovibojedepimedale.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/zelofoz.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9rm2ap1k41ulvf7sfbgkoe7anu/gefozevekotuvopave.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/pufasugitikamutel.pdfIn PDF document text
    • http://premium-t.info/files/files/58620099027.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/xivipunemamaxitik.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zazinogixodaje.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087731d42f82---sixegubotebiguxiwuzep.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//87527690128.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a47b0854f9f---nalodebenam.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/28971960775.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/38884776799.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/27264207807.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/puwebigasagonotowisulus.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/86263208739.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/23551910806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=study+guide+review+absolute+value+functions+equations+and+inequalities+module+2PDF link annotation
    • 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_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A7 11668 bytes
SHA-256: a1c1e8ba2e74f9cf91693a118337b4b9b8e6f3e0c2181eb31f0751f91fdd1c26
font_02_sfnt_off00014e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E00 17944 bytes
SHA-256: a5a035c65cd4856279860ed8c9b0024d9dbd2aefa22e926d4a9ed41c41b1f6b4

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