Malicious PDF — malware analysis report

Static analysis result for SHA-256 87098895133e114c…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 18:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56eaa4d1ace7af92d1d76a1041981c4e SHA-1: 0e5b3fed278c8a8a77511bf826de6f6b021e4a6a SHA-256: 87098895133e114c723ff98eb346795531ce3037cc53a2f99aaba0e469c1f274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://allytemp.ru/uplcv?utm_term=organization+that+helps+the+environment
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/532dc98445acb0e3bc20c789cefef9a1/litoponotonevarugus.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f101938cf252c562613473d4530e7047/43550468973.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b97180c6ea---kujire.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef6c48c73---dijiwun.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/o30fa26bcbern3vb2qqjl8enka/rikawotipimetinowetazes.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dk27lqrj23mrhcpckv2lmltuo8/54368809815.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/64982e2fb7b92df58c7a4fa9fea30469/22932378643.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d773a4710---37621332186.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/10085361715.pdf
    • https://amatnieks.com/pictures/image/nutolagelepifopanijawipuk.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65f718242cc9643c421357bded58b809/79230253031.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9cad64a844f4bb8c5723b8de97e75b4e/letobaganodib.pdf
    • http://zaun-produzent.de/userfiles/file/jogovorovogonoxeguma.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1200345bf16c72031e8b9fba96bd9962/77762099688.pdf
    • https://alzubidi.com/userfiles/files/tujigilubujivulinusit.pdf
    • http://macautemple.com/userfiles/file/memewuneduzefaxobe.pdf
    • http://weingut-suppan.at/files/sufuzebosenikupat.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/f95htjpsgfh0jf74cops13be63/72690049217.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b052ed1d2ac---96238078155.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/31067560363.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0521bf2aa97c9d0136d514ef9ba84c48/29055463815.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/781671b3e6d3c2a6a6906719d1a004b2/xebesajufam.pdf
    • 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_off0000edfe.bin
38fc1097d954ab18fe821df7abf9695a6269a3288026bda46e0274e985809fb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 17132 bytes
font_01_sfnt_off00011af0.bin
c490d9f300e08a8f71ebe97eeab60a5f2b532addbbf46fcf7e68d999029a1711
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 10852 bytes
font_02_sfnt_off000133e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E0 16792 bytes