Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdfbfcc4a9c8f7e…

MALICIOUS

PDF

96.0 KB Created: 2021-08-03 11:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ba940d3497e312ba0288ce49149cfe7 SHA-1: 7738a8b66432f3046b63743e880f2c95197b6582 SHA-256: ccdfbfcc4a9c8f7ee2bf36fc9c15c16038d288ba1cb69ca4317091d4eaba3a8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/smh8nivek5k177hh4kfftv2ef0/sitolorimir.pdf In PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/amiipl4tji8kgnmu63folcn3b4/18504503781.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/56322528607.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/luzawe.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/59048030472.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0a7ee4b16a240d6bdcc9fb197f97f725/33430660540.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/gizusubaxusamora.pdfIn PDF document text
    • http://sdes.in/uploads/gagiza.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fdce732f---22541694648.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/dikumeninuvitodopoxutupom.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/52782753197.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c734eee8---89366122168.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/mebumakatedo.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/90811059900.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/vuxemomokemojepokel.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/depanubutam.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/vaxezenuxefopafeb.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/67534492757.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adc54a3b10---8128200635.pdfIn PDF document text
    • http://fedime.org/imagenes/34106711877.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/7288024307.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/didisejugajugawisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=suma+y+resta+de+fracciones+con+diferente+denominador+calculadoraPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 10928 bytes
SHA-256: 32f9f35c045ae50dd8ba47904145fb705d51bddb06d9821b1671ed4bac56f02f
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 21292 bytes
SHA-256: 9003de1b56e2651e1849f17121784e28ee85fd64c7a493a2611519a1d3e2951d
font_02_sfnt_off00013238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13238 17228 bytes
SHA-256: dedc273134427e4387c8261281fbd614c43028427378640b4d9445656d634529
font_03_sfnt_off00014b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9D 2652 bytes
SHA-256: b7e87075cc5afad41188b523144572693a90eecb3cb76f3c6c7b2995d14b462c
font_04_sfnt_off000156e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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