Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d38e76515c4a87e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 22:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddef44a2754ddf131d1a008ad844de85 SHA-1: f385b11771079ca3336bf6aa4390411c4344c379 SHA-256: 5d38e76515c4a87e9a995eb3760b5bbf09d53cdb40ad0bf2c3f8b874df3c9991
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soc-in.com/data/media/files/93286928977.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5feba5c09c---35932890667.pdf
    • http://nkmate.com/FileData/ckfinder/files/20210718_E32DC7541C48D53E.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b7f8e95294815e7f941e944c6f290f88/takibuledebul.pdf
    • https://feltshoe.com/userfiles/file/52354723238.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69c3774a7---jugekexodutexoxizavi.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161041a7484a16---zaxozexilurikitafejege.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ecb7f7cef76e87e9496a99477575a552/32949481335.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/dabanopefirufalana.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9h76ccblfoaj08jubg4v5fofbr/fawafibilojijafewekapi.pdf
    • https://pingthye.com/userfiles/files/25262038058.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/h6ct99047ikr56cpi1p9ae0b9c/65382524853.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/317ac5d430f1f7fd25007ccdbbaa8010/52299946972.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4fcdb99c3---jibomodozekerikemategefaz.pdf
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/6265320635.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/dbc928ed800ac37c1cceb667011a6242/gawuwizatudi.pdf
    • https://aterhesseg.com/up_image/file/42390323850.pdf
    • https://paron-rebondir.com/uploads/files/gukotetewitunafeme.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c61f5fa92c8---tivuzaj.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/fd2b319c13781879f4c5d5a55066c5bf/31804199965.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd855b5b7dc---33530276975.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f61b5ab51a---30683034058.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc1179f9e---69445738936.pdf
    • http://polloricowings.com/uploads/files/86761740594.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=barefoot+bobs+owners
    • 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_off0000df4d.bin
52b2dbfa17d3843de06a143a4c36202e9cf16888e673375f2451b084ec1569ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 10348 bytes
font_01_sfnt_off0000f6f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 16792 bytes
font_02_sfnt_off00010f03.bin
c00a2af26619928479a8e414956bf70586af937593d375753f2563b7ef3dfa5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 17264 bytes