Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e3738f6f543d2e…

MALICIOUS

PDF

88.3 KB Created: 2021-07-08 07:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b518583d91cb863b43e4290dcb1d7aed SHA-1: 1709d9f1132236aa654b26316f94269cc10b8fe9 SHA-256: 58e3738f6f543d2ec8bba380dfb5b4b4906923885d3cfaac649c8e287078a712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The document body is heavily obfuscated, but embedded URLs confirm the intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c91b9e944---kewadazesizirifuvitor.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a1b4ce96b38e49e42fa1b76331c37f09/39739311804.pdf
    • https://hkbca.org/UploadFiles/file/20210708041605109.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/lc9famdkdhgh00trio5o6077u8/80672183315.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2e96ba735ceed5a1ca62d5a199f5198c/fesizuxovap.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/j7767l70kd4gj3607i9imt3fdk/42912495287.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c343009e446---dililovaper.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23f3a2844---80707502737.pdf
    • https://drlanda.hu/user/file/rufowezofomewimorobojede.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10dbd2e380---nixup.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160779fdf760c2---69715374050.pdf
    • http://thienanglass.vn/upload/files/75633151510.pdf
    • http://ajk-opakowania.eu/upload/fck/file/98157302021.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22a634c31d---32235896393.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/4c4eadhle7e4p1agoskeuuneb3/37409585069.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b91b7cc776e2fec4f14fd81954ed3669/91133537327.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096154785de9---91085638295.pdf
    • https://sarvodayasamaj.uk/upload/files/bozitapumoguvij.pdf
    • http://cfacgroupe.com/uploads/FCK_files/file/22579646205.pdf
    • https://fablab808.com/nbloom/fckuploads/file/teminotoral.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201afc9d4c---novume.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/175786f9bafdf011c050fa6f236da593/92450356024.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb40e0f48---34184955711.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9221483a0c---58289891688.pdf
    • http://busankid.com/webfiles/board/file///tamufigosiwilepamutaled.pdf
    • http://mjacz.cz/soubory/files/nanugurejovi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+data+flow
    • 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_off0000f56e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 16792 bytes
font_01_sfnt_off00010d85.bin
75953844ee9dd7d9ea8928affae2636f4aa6a103e9266311e8966cc836864fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 10340 bytes
font_02_sfnt_off000124ca.bin
b90e4c2953fa72b0b539052254ef471741cd6c8670c4de4b91981053bc738a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 17500 bytes

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