Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3bd34d65e3bd46…

MALICIOUS

PDF

92.4 KB Created: 2021-06-26 11:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8ec361a858ce61ab62b7bf04955f69c SHA-1: 34ffcbd5e27ff5666ff24375ecf8cc4f30b60214 SHA-256: 5b3bd34d65e3bd464c17db04ef91f908c452391acf72324b0802d6b79df0f4e7
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://harasim.cz/uploaded/files/65521478479.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609acac1a44f7---17660254918.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b7ea8761---8184873772.pdf
    • http://gursakaryahukuk.com/images/file/fudomulup.pdf
    • http://asijskepotraviny.cz/files/file/dalelapesuwij.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1birqodhpegbtk8q7vom11tr25/49516235504.pdf
    • http://dynamic1984.com/user_file/file/30558750864.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c0e5af706e505a492807c0a35540b7d8/41370924587.pdf
    • https://amitadevnani.com/userfiles/file/54225955455.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2dd1a78b62d824680a536c563ec71428/sabor.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b930f8fe5f---60069244509.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1e035528c85ccb111faca39a3d571584/9603415145.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18e9bed5b---48092888858.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315da27756---50237796210.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad976909cde---58005232310.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ae63fe9fbb0138b7958e09c54bda80db/motemagekosumer.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3168f81e---titanimowipetobaj.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a17b14d1---mopamakopilopixaw.pdf
    • http://cbcom.eu/ressource/site-image/files/16500058756.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/cmutu4ndoq9mfsmd0fd08neh97/67804966441.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/bb520e66a420a96c13532406279ff7b4/84942019872.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c12e6723---razojifi.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5c9acead---kowuwutefumovapux.pdf
    • https://protrialse.eu/files/files/kotoxuzipenisav.pdf
    • http://kartywspomnien.pl/uploads/assets/file/80795121029.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+repetitions
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13c.bin
ac5ec8366d98198b16fc43d467b092db497ba573e4b5cf0e7e0843f454abf5c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10480 bytes
font_01_sfnt_off00010931.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 16792 bytes
font_02_sfnt_off00012143.bin
b2abc44830945f4a994b2feea4d70526ae166831224a1fbc903558962d29f468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 20708 bytes
font_03_sfnt_off000157ab.bin
30f6ce099852192e91982efb20399b5551c6a51262d0a93717b41fd8c47d3ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157AB 2412 bytes

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