Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e806ace2ed8ec1a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 06:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9b7983a5dfbebf303bb7bb1c931b0c8 SHA-1: 85a2514648ed89170c420eed341a0894c9be5934 SHA-256: 2e806ace2ed8ec1af5dab3ea2366666bb722539f276748e97d8f2ba075afa598
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://phunggia.biz/userfiles/file/37681401151.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6b288045---muzowemujenorazevomenas.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/pitubafovulozuze.pdf
    • http://burchiellati.com/file_fck/file/geritonikev.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1e4be234e8cf9f1fdddd9204ee3eee35/mafenojeluvisek.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/ripit.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c18232b8ffdb4ef799fd0214006b2591/bojoruzawalowowaneweg.pdf
    • http://lucann.com/Upload/file/zakowidubixilenimixenefa.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161143b906a598---31608887070.pdf
    • http://dietetyka-24.pl/images/files/39528277201.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af79127d9a8---67008833696.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/11929997142.pdf
    • https://ludifrance.fr/userfiles/file/16242689812.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/3oqdkenu9d7d39g3nmgojc48tn/19972754608.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/h92mdaf0t2cdsnb04rh713tis4/18539402756.pdf
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/xapunazimizabeja.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lodurogonejiv.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/980c8d5444eca84da1c117217d410fd9/gamakisifibibeji.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/87100284395.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/mixinulimusabaw.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd4418c4d---97054079081.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/2a947599a9951007862c53d28c919f5d/98994432706.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2facfe0ef7b76f188dfef4eea4d46dd1/bepet.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f79f99e0a47902f41a621d22330e8b40/pilopopaxudukolodolevu.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5aa8ca0a89e6d6003266025331ab853d/88157561851.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=making+suggestions+worksheet+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_off0000dba1.bin
478ba607c4ca301787cd0ad429693fce1eb39d4d13aa9661fe004dc93b3a2283
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 16892 bytes
font_01_sfnt_off00010756.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 16792 bytes
font_02_sfnt_off00011f6d.bin
9737cd00d82ecd6a3102f14d1595f437460f21b9ca2533eac32a86e2607b3350
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 11000 bytes