Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38458abf7aac6fc…

MALICIOUS

PDF

98.4 KB Created: 2021-07-01 11:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f279c449396d9e82afe42a7e61b51e28 SHA-1: 2e53edfc33d9d613b69c666799ecf722c0a8a87f SHA-256: c38458abf7aac6fc0dfb0675e3c924de80c474ed387b92fce8718b124ad95c79
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or use link farm techniques. The PDF structure and the presence of external URI heuristics indicate an attempt to redirect the user to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://philabc.ru/uplcv?utm_term=hard+diary+requirements+osrs
    • http://sugarfree-gelato.com/upload/file/kokumijobadebidagup.pdf
    • https://alshamiltrading.com/alshamilfiles/file/lotolib.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8f81209c372b3de2633c5f6c03a8fee6/molig.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6651e07221---jilusodegajunadix.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6e6658a2c3d4df3cc3f7317986ff52c6/41579098113.pdf
    • https://steklo-shik.ru/userfiles/file/98731211964.pdf
    • http://aldo-ins.com/userfiles/file/71762462383.pdf
    • http://abwmountvernon.com/uploads/files/temixafedovififewuda.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32462e295---naxen.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/6203097be5d361f5bb21047b12019ad3/mogavadir.pdf
    • http://ztkammer.at/uploads/file/wolajuxi.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f508c4f03---23750921423.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/b430252058dc98538b0d3d8f704c083c/18876166041.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/89catdpk6dmsku6tlj2ml5lveu/3272772074.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69343a17a---21359770185.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af9bac19874---4230184756.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707a3b379d3---xawokez.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/90de40fc5d80f89061e29eb8f0250c64/97611144028.pdf
    • http://ccswcd.com/userfiles/file/giropob.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/08aec400801571544a734dd5ebb882fa/zilowovugufodan.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878e041f87---6320340523.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4827a7c77---tadipiramodirogare.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9ri8kgrf3092ec632hh60ndln0/67015217179.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d5b31cdf---63083021747.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ba64f408f93eddbba8a0e27b79fd5766/pesaronepigimisinizibu.pdf
    • 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_off00011f5d.bin
867d34ecf5c9c3d097925c9d3f9febe71c3f204a40edd486c464c8aabbce2155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 17084 bytes
font_01_sfnt_off00014be6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE6 16792 bytes
font_02_sfnt_off000163fd.bin
b86e85e124fa21c36da78bbc6abbc150a817b5486d2f1bd5a9e10e311b137329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163FD 10716 bytes

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