Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8310636ff0cbc0…

MALICIOUS

PDF

90.5 KB Created: 2021-06-26 07:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0c52829e108543b6cecd55778c9f49f SHA-1: a8ed72158c44af0cae78120c656f2a01d8e217c4 SHA-256: 8f8310636ff0cbc04efb1190c4083c171d81ea3494e1321758806535b7be9f02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded links pointing to various websites, many of which appear to be compromised CMS uploads. The primary function seems to be directing users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://medvor.ru/uplcv?utm_term=was+jesus+christ+born+on+christmas+day
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/stb9foa6rgseqjis8u7de6eaa6/10806628611.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/k2n00aecda4k2onbstr3ihu2r5/tibodugabe.pdf
    • https://cuisinescartier.ca/upload/editor/file/bigali.pdf
    • https://ahreco.com/uploads/news_file/rebemorakom.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/uhr7jrn42pn29fvoio9g087non/gumonogovep.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb8e5b640---57021476847.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/zubobitivuji.pdf
    • https://anakmeong.com/contents//files/41083071656.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ob5de4jibv20m2j18b1ulg1ke4/zazevenuxafeda.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1644d04b---64553156595.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ae05bc81---notixuzodukamitanegex.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/1fgjhb7bauflg6fcn1s3uearj2/71804179829.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0a3300230---720400306.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/19177093629.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4f6b8f67b---suwozulaxerix.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098e981cfc08---55956939252.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e11c32d01d---75754781091.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/turenodejosaxese.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160889ff5e7f74---41223119704.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/pofopikijozisutujovevewaf.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a718159b253b1aed2537d1d4599de3b3/42084728058.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4bd68e820ad6345f3549749d6a88a461/39932784916.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d62401c04---24109345581.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8242703028082b04d96352327f39ce00/xonupizix.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a5fbe0585db1f82f2d1151c767729d72/zuxatosiwukeluzuwu.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c49711cb903---rilifopakuvusonuf.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_off0000fc11.bin
11583336868608ba0660cb0041ce97afd9f4c6e9d38446ab4dd8e8fcd8dfd5d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 17916 bytes
font_01_sfnt_off00012a8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 16792 bytes
font_02_sfnt_off000142a3.bin
0ac94106254e5c26bd55bacdd81833b94720b604a10de877972e48aa312251d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x142A3 11064 bytes