Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa2b0ddc9b3bb6a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 12:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 596ec62e892ceaa01bad87865ed0e2e4 SHA-1: a72290efbfca282953a7160acc9544fd9cfb29ea SHA-256: dfa2b0ddc9b3bb6a0084d38de30dbece63bc34f02cdc1c8974474d5bf489d6b5
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and executing malicious code. The PDF also functions as a link farm, directing users to multiple distinct hosts, some of which appear to be compromised WordPress upload directories. This suggests an attempt to lure users to malicious or compromised sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sushiosushi.com/uploads/files/82685976705.pdf In PDF document text
    • http://mcserpenti.com/userfiles/file/86851275498.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109020136486196.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/646c3517821c2d2b89ac906ded261485/fowagewudupufi.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/danagodunozosu.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/68968909204.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/xipotenuwuwokub.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/vanuxojezexibikogimad.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/50931515830.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/86298135796.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/95725744257.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a4au2lqtonbftdkd1don7j7nn3/41100379126.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138255d28057---92776443487.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/belowovuze.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/19550231866.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140edfb17b41---22682646718.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0022db890f02dc7ec1188aba08b8da32/xalirumatoxe.pdfIn PDF document text
    • http://starma.pl/files/file/86589569141.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/gelelujusimajonuxipepemim.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ac71f4984a68652a35af1bd5fd496aca/25133875495.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/mufilibesaripokumaxo.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/gatonosasivezajixiso.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fec598c921---wobovevamoletarufevane.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/69640713182.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/gugofubalexuxafaxinil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+hack+someones+instagram+2021+freePDF 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_off0000b488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 11200 bytes
SHA-256: b8697bf1a3ec447df698a42bc46796fa89ed2db5eb6ba061bca9acf6a6b077eb
font_02_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 16156 bytes
SHA-256: 25891054f09c3f86eb1ba72421c651b4159a657087083c00389184bbaad9e455

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