Malicious PDF — malware analysis report

Static analysis result for SHA-256 958928f337dc5e44…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 18:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26e1c35b56f113a22ae1395c0ff76981 SHA-1: 7285d4cb67b42ad65342fb110ea439e62de39095 SHA-256: 958928f337dc5e44e0e01a9692b1e53e988f6bb95a7c49d100e9f3301946e9a6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gibisch.biz/files/files/bekenowodi.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/57760496994.pdf
    • http://toshiba-center.ru/uploads/files/pipagoxifikugidide.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8b556d84---misobiwinarosububitu.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbf5258bb---41159169946.pdf
    • http://kiiga.ru/userfiles/file/93314993355.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a5204097c---75400812813.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/40a908391100df02e71a7c4576efc5f3/87792839649.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a330a66bc664fd31c4b2235302bbcee0/sazut.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/minipow.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d03986c43---28765268981.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8318a0d0c27be1ae49d605722bc7747/fuwizefoverarawuvesigu.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b3a87c3e08eef1968837e29318864b9d/budilezafagi.pdf
    • https://aartipalette.com/userfiles/file/rawefamurita.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/zutijonorutobamofodomem.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/83737109829.pdf
    • https://mps-india.com/userfiles/files/59316175738.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/731e5b9b9262d1631f142b7deff47010/95241218034.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/5f7d6ddd934bcc33d1811bf96761bff3/23728599837.pdf
    • http://myucmas.com/userfiles/file/22628730270.pdf
    • http://metapolar.hu/tmp/36495329428.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1657aaa0---jowudenitijijonegexu.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160827c7877e69---23315930228.pdf
    • https://malashealthcare.com/userfiles/files/silidenep.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/71997723231.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=country+code+51
    • 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_off0000f96d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 16792 bytes
font_01_sfnt_off00011184.bin
86fefee7d76edf387629716d0d3b545686a1a5c58d8c4b4871cb104dae288698
pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 10328 bytes
font_02_sfnt_off00012911.bin
002de6ec78b5eeddf2d2f1728f9b97cc55d92d173ce502fd8b29bc8ff38fe2b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 20148 bytes