Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f914ecde6265bf1…

MALICIOUS

PDF

96.6 KB Created: 2021-06-25 23:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdba2b4c7fdc11f01a831b31ee060aae SHA-1: 649e8ad77df27971082648ada1458657e61fac8b SHA-256: 4f914ecde6265bf109d15420af80fbc0ba14dcd6ee8db26fcadef7b219225e7d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely serve to redirect users to malicious content or phishing pages, facilitating the distribution of malware or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • 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.
  • 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://pmcp-avac.com/files/upload-ckfinder/files/74969217086.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8581520094---22425021025.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/73695984220.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102afe819d---mumoliwivufu.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ed1ca9b5526b606ffe321dd1d5a15bc3/31237587319.pdf
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/kojakofadesotavipewuf.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a723e6831e---vexapemamakomutakumutes.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5138d952356fab2debc16d9bc8483969/82798804742.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fb8de10bd7d6226d5d6dc37b1ec2390e/zubuwuruxidewupug.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/r2n62jgsmijm8i7plgd0hrjgh7/17905755018.pdf
    • http://startmatbaa.com/userfiles/file/19493332154.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f40c042df144b24e6c3f0172ca7ec5eb/68314362007.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3aa09ea9c19bf4a587ea890d742897b5/73829983842.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3e12caa0---lemenajojenavu.pdf
    • http://falconfam.com/ckfinder/userfiles/files/99169551453.pdf
    • http://mtsskzy.com/userfiles/file/15206663564.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72c3ac03bb---gusujulatukakafena.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802349507d7---24263429380.pdf
    • http://birnagarcollege.in/userfiles/file/refuresetukezipez.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2691188a64---65092117330.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b1af23798---21544608943.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/e1un7pi8vt2fr3apqos528a4p6/75786549011.pdf
    • http://odpadykj.cz/UserFiles/File/30715521332.pdf
    • https://ajansnigde.com/resimler/files/dovivaxajevebaxameruto.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083c2278ed40---fozufagogego.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bff+meaning+funny
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f985.bin
1ae8856fe61e863e8baad6e453436f276c42662d6b3316c02edcfb1f76a18d93
pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 20500 bytes
font_01_sfnt_off00012ee5.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 16164 bytes
font_02_sfnt_off0001445c.bin
a53e5ea9caaf234cd92218148ef2779806c0c2ab317a8d685181442402c16238
pdf-font-stream PDF embedded font (sfnt) at offset 0x1445C 10292 bytes
font_03_sfnt_off00015b83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B83 16792 bytes