Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8797f2073966b0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 07:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f78d3e5964d2d54e7b2fa17f6667185 SHA-1: a4cf30501446702485a9364d67022252facd21b5 SHA-256: fc8797f2073966b08bf10aa2385ac2932f6ea0ab4c9a4e677b4abed85d22ddc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting. The primary function appears to be directing users to malicious external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=android+margin+percentage
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161335ea3f1c3c---berodopod.pdf
    • http://hilimall.ae/uploads/files/pumurugerijozorewufuxevoz.pdf
    • https://galedo.cz/www/data/cms_files/files/xonebi.pdf
    • http://leaguengn.com/userfiles/file///tuligojuk.pdf
    • http://pro-customer.de/userfiles/file/22239577785.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4rl9jne6seumm0tedjo6d1ihff/27986776183.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8kp1mhqdshemkotek0sgs55ik2/50334426991.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea102b9a3---xaleloragorezuneradi.pdf
    • http://orikon.net/Images_upload/files/sogulimoteserutepiwow.pdf
    • https://oferta.lt/i/File/kagozewujudedozodiretige.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ae0226e19ad017777bd7fe0b176ed6c1/10495150201.pdf
    • http://3q1p.com/upload/file/2109181953268415023m0mdu6k0jjd.pdf
    • http://ahkjt.com/upfile/file/1238840806.pdf
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/bumadopojituwuxurerob.pdf
    • http://ks-klinika.ru/ckfinder/userfiles/files/xusomogimivikajowugowopim.pdf
    • http://wwm-quanta.com/upload/files/28435940448.pdf
    • https://majubesar.org/contents/files/89513255526.pdf
    • https://etonbio.com/newsLetters/images/file/68138709902.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/44592555544.pdf
    • http://villaelen.it/userfiles/files/68881354085.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6oql7h23adgosop6j2170tol8c/11408829186.pdf
    • http://showplus.ae/userfiles/files/51238399712.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/75210878541.pdf
    • http://ecolservizinettuno.com/userfiles/files/89509479957.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/di9djg25b479moja993e9oe412/jigomusozu.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_off0000bfa2.bin
8dd7bb1057c93b0515cf9f9f2a3692e3ffed86fd3f551ea8745ff8307966a7db
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA2 15828 bytes
font_01_sfnt_off0000e7da.bin
cb00c3993bdbccfeb17848950adedb8badb40c889ffb6129a2ff3907c6966870
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 10624 bytes
font_02_sfnt_off0000ffea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 16792 bytes