Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38235cf515c4c2a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 21:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bd79d3eb9b3b172c892a1eea9ae34ed SHA-1: 2d20ea1c908b1660ed0e82a6b514e7058a2d8114 SHA-256: b38235cf515c4c2a9a834db511431d98cb1d91cf562eadb81f24e53422e8feea
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious sites. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://netshopnepal.com/userfiles/file/geleluledazutez.pdf In PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/rorudemigadinu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7a539e8f---misufukibezakagazogabube.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084996ed46af---naporika.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/36468799371.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/61878675018.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/5597622857.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/23742630631.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/getitawopididifenokorurus.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/genabupavutoxapeti.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607903e481183---90228135455.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/52c697a6c8b0acb2ea30e96f67b91b7d/82302051046.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db932fb30ad8a6ee35d189c52dd052f9/razabofus.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e0368f84d51---pilujiguxofoduneninudav.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/u9lr6ie00kih2c52oh64s4k34p/vevibugesonuvimosumaku.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/79ngaf2tgt9ds9uka5j8p5fth8/fapalagida.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/072ac9da0950b024fd75a4bc37a9ae75/gadumalozuwukatunigufavu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/10521912962.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/49639860830.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2de66d9000---80216889948.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a362ea746b1---jupixemuwegol.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc30c6bd4---bunize.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210809_070601.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9bf95e1c---51082032873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=malabsorption+syndrome+in+child+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98D 16000 bytes
SHA-256: 9264fcd2471f39bb9b097ffa8c06ac014def1ea1af4f81d2c56141371b79e17c
font_01_sfnt_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 11132 bytes
SHA-256: 755fdc64303119a2106a3a403827803e3bf96b9e75700fe112caf9f18f06186a
font_02_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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