Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3fb2f453376fa9…

MALICIOUS

PDF

95.0 KB Created: 2021-07-05 09:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef1f9828b5cf5279610b227b783a8733 SHA-1: 783cf7b7e0f2e1e6393c29eb3083090be65f066b SHA-256: 7d3fb2f453376fa92843a7148427d11aab9b437e02bfbf961b8e46ff1345a483
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content or phishing pages. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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=autumn+in+my+heart+episode+1+english+sub+full+movie
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5542fnsuhi6jqd4a0tnj3jbl80/fofunaxitorawutuziki.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/31c8d042b16d86f54e8055572bf0dbf3/lonowuxetatesixasufokini.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0349e6be8---vinur.pdf
    • http://chinamakina.com/userfiles/file/pefap.pdf
    • http://jjinline.org/file_upload/file/peloburujujiweduzimotep.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qbf1sisuv31t7ua2dtgtjijlaq/71690801164.pdf
    • http://pastoret.it/userfiles/files/nifutovimofotagoxus.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b138a8016---65643037710.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2902dd83---48066691535.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609364ca28bba---10999737636.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e32a24d3ebe79689f6e6becf76d3f7f5/84665133570.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c817473537---wusedajuxizizafejit.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079a81a7e080---77269841604.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/9817760622.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/23ebd38e8c7e283f08b65e2340d458c0/55084477503.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0af60e383---91652219921.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8621fc009b3084266d5266d44da17ff5/16401533755.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ch5p7jvmn9h44aftkqgk3n48t1/gebibinuxif.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/78883007611.pdf
    • http://deeringbayrealestate.com/userfiles/files/77386115495.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/bbaa4154f22947203b7e2549487cfc73/wogeriw.pdf
    • http://turagent007.ru/userfiles/file/40311560125.pdf
    • https://biocoils.com/img/file/36402495525.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/decaeff473eb523cbef2c6d308fd747c/wuxejeforulafep.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010321.bin
41225a0972d2d6e9122770f0441e968ed3981d0910aeba3ba9bb7e3b8d9bb4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 17940 bytes
font_01_sfnt_off00013226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 16792 bytes
font_02_sfnt_off00014a33.bin
6778c3f034e6c7d175087c4aa10c67ada12af7d05375120ab37b48fc6f18d252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A33 2120 bytes
font_03_sfnt_off0001538e.bin
63dc85b0be91eb4c9fe49c72848d3697f16f6f7fff7c681035dd643bb8be2e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1538E 11396 bytes

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