Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d9ebdfb8c2e5d9…

MALICIOUS

PDF

108.0 KB Created: 2021-07-07 08:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 551b75119b2b6547f74a46157c09cfdc SHA-1: 806b880ca896616d1c5bd35cb0f5e68e0e4d2c62 SHA-256: 19d9ebdfb8c2e5d9c7c977f476025d3a568aceff789b625a9879d7202ed4580b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and link farm nature are consistent with a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/h0b1hgfc5sciccrashimavnn6h/xukugibuvivedenebivojon.pdf
    • http://ibtaker.ps/userfiles/file/vegogubus.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/11631706818.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nq77jpo2pasegj9cg59c9pnnnb/movuzevowi.pdf
    • http://edgecs.net/documents/70819667282.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/39582409237.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64b9e4e99---deboduweronefixag.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/topilapulakigipesokal.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2be18877---rowipegafuzibezo.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0dd55d09925042c10708d0ce888bbc5b/43416559078.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c7f9c17f---86765849258.pdf
    • https://abofahed.com/userfiles/file/81388712674.pdf
    • http://animalscipublisher.com/files/upfiles/file/13760251141.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9817be6e941def90f1efa0d3ef3334a7/39998600815.pdf
    • https://33mobility.net/uploads/files/filit.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/q4n6jjarq4a2k6affup8squb47/xeronegumisajoxalaxuwovi.pdf
    • http://peaceinsrilanka.lk/userfiles/file/78393116412.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d542db31744f058aa959ebd8075672c5/73079012948.pdf
    • http://sibservis.com/ckfinder/userfiles/files/voribofawo.pdf
    • http://vtvxm.vn/userfiles/file/16740870533.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/jdsagt4o3mf0fep577v0hsv0j4/95146330753.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d916f9018ca---jaguxagufukavogifil.pdf
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/55973332611.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ef1510d3fc572a1ea9e07aadc982c306/napuka.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/49b227ad02557a2a4861be244b073106/rubipotodajutu.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/56992401042.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43c8cb4526---zuxirixorivaxorufa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=check+flooding+in+my+area
    • 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_off00014469.bin
15dcce3a8393292f62b016e542670666c40a4ef8c4bddca8ed494d2623e196cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14469 17220 bytes
font_01_sfnt_off000171aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x171AA 16792 bytes
font_02_sfnt_off000189c1.bin
64fc35c89f9653f363feb359532c5a0ade17f855af0dd06ba44bb2b3816134bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x189C1 10896 bytes