Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7705fe54ac6980b…

MALICIOUS

PDF

100.5 KB Created: 2021-06-26 21:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8cfdaef73d67512967257cf4620dfb6 SHA-1: 92d7d4bb9985f5ff67d51b9c00cbd8371ac769bd SHA-256: b7705fe54ac6980bf4cc96ead0acea4449019c14a08c1310bb0017ebe48cff6d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and disposable hosting, which is a common tactic for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns strongly suggest it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://gzky.cn/dubeite/ckfinder/userfiles/files/20210615_144704.pdf In PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d704a2b51b---80253292426.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/95344476543.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab88ce1fb---45968029936.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/roruloveda.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/bitubifomuforekomuw.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/elc9hdps1mo84rbou4nctdn1ek/xidezegivekamajenawafeliw.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d275315725---94312558039.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/412f2dd6e6c02ea4ca8d781bf0d1d9fd/58212798467.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4241e806d13ed172596e6e658e827391/4925441370.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/97941855799.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3d4a5990---momuxigaxamufokonelazejuj.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/68709294142.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/tuwanajalitidozodujigaloj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e4d7e8cbdc6cc5f5391a7bd4eac4d5c0/tokuwunopolisopel.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b80151cacd41d767110aea0bec181319/dixusomiwabogi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079b8cee0879---wusidenedobuwad.pdfIn PDF document text
    • https://gilbertems.com/videos/file/66388790146.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210614_080459.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/zisazafeno.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/sezaborunupolaxusonu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906582a227d---ragevaw.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/75457847536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=god+created+man+and+woman+in+his+image+and+likenessPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 11032 bytes
SHA-256: 77cfc46065f1e8bbe99d2589b534fed0e4cb49ecad90fa7361f76073a7315644
font_01_sfnt_off00013f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15799 17228 bytes
SHA-256: 381625f76b7abefcee427c7964224f96499e6e4918fde79689ecf70b0edc3ba7