Malicious PDF — malware analysis report

Static analysis result for SHA-256 488ccf3395a14009…

MALICIOUS

PDF

85.8 KB Created: 2021-08-07 08:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88636be709e98209c4f2156a786e08d6 SHA-1: ecb624497eec1192a47223ef004d1a25a2d38daa SHA-256: 488ccf3395a1400972a3e26aa33e47d7719d3b143e84aab66e279c52cf44ffc5
236 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It exhibits social engineering tactics, instructing the user to disable security software and execute a command, which is a common method for bypassing macro restrictions and downloading further payloads. The document also contains numerous links to external sites, many hosted on compromised WordPress instances, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://philabc.ru/uplcv?utm_term=why+does+my+steam+download+keep+stopping
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ka103fjfohdo4fbnf6dfppiec/peduni.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086b19c3a9a9---5706969160.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f274f1c03a---tejopaj.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/paxapajekaf.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/9555436d1de421f81f1ddaa20696a973/79693616789.pdf
    • http://bahattinburyan.com/userfiles/file/86431968742.pdf
    • http://seritour.com/rsm/files/kaponojolarewogulufa.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d391b8c8---56053699011.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vfi5iht49qdsao39g48fdqq8sl/434180634.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/14434369624.pdf
    • https://hanahana.vn/media/ftp/file/90737217167.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/83fc01fa947c38c1f35a9cc2a8776137/86251844110.pdf
    • https://esvigo.com/upload/files/92355685627.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0832e49f4---wotelugenog.pdf
    • http://jonme.net/ckupload/files/kumobewuboz.pdf
    • http://aucoindeshalles.com/menu/file/3247312769.pdf
    • http://farmaciafici.com/userfiles/files/ruzulogivaneguzuwe.pdf
    • https://ocw.tw/uploads/files/fazapofifidadu.pdf
    • http://luatsugiadinhviet.com/upload/ck/files/funuwufexuze.pdf
    • https://hanyauntuktesting.com/contents//files/nakorizifez.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/61286052725.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a0d7c0d2---29398027904.pdf
    • http://bartuceviri.com/userfiles/file/69998429064.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f35e10fdbc4b01986cb07d7346283c11/kibuginozepagobuvilozuwop.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_off0000ead1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 16792 bytes
font_01_sfnt_off000102e8.bin
98ac9edbfe0169748c166a47155acd8a1fec45b0d92e047fa1c739959c63db74
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 11024 bytes
font_02_sfnt_off00011c30.bin
c307fc5fe2a9b94992c85d924582537aca1ddbb5f875939c6143c53c8d79da6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 17144 bytes