Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4022112c8557d0f…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 07:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c81f545751a1dfc0286211e2c45f044 SHA-1: 3bd3e074fb07ed40cb0fba30dd0baca290cc5f07 SHA-256: d4022112c8557d0f53f80c8ce4b7ac9d4a715fb4bbfbafa8170e19f3a7555f0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=difference+between+concrete+and+abstract+words
    • https://angkorphotographyguide.com/userfiles/file/molafobugikeso.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/07e163088b0e1a04ca10b948c513756f/solasewiralajibagu.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/028e33b3123607f8d8c54c031c143c21/70556682576.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ia1ejphsmulh8cc439t35jhhk2/lofosi.pdf
    • http://jamessham.com/admin/usercontent/file/49266009850.pdf
    • https://cdmsig1.com/ckfinder/userfiles/files/majowufilufune.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ee7edb4c81804f288dbfc18742ade940/53990469148.pdf
    • http://ash-graphy.com/userfiles/file/nuxujuvojan.pdf
    • https://ktmcollege.org/public_html/userfiles/file/21275097559.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e9f8a56e40b04290884cd2fc537cf7a1/82666069608.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/siruvurosatuz.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00d945a46---29123900277.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd91d3149c---33084895155.pdf
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/kuwepoxutemonemuni.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/7464718133.pdf
    • https://commonwealthsportsawards.com/userfiles/file/88537068409.pdf
    • https://loctra.net/userfiles/file/ludiwusagixixexita.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097658e8da25---48910781149.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1374tlruahj8d7799ktqb1jj9u/69935641495.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b67650494---51291692775.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/11eef3f91175b534ce65484670969bb3/tibalojilazunaxu.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d02133b17---29394101503.pdf
    • http://sochistandart.com/ckfinder/userfiles/files/87962597986.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8534998a---viwobonajodigajebixemabi.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_off0000f538.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 16792 bytes
font_01_sfnt_off00010d4a.bin
089e3447d73d2425e59b22d20e0b14d298447625d87e96b10b1934dabd718bef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 17252 bytes
font_02_sfnt_off00013a13.bin
7df038d8d65fa48696cf3940716bacd8d8c86cd0b847e68f30972b4a1871ecb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A13 10652 bytes