Malicious PDF — malware analysis report

Static analysis result for SHA-256 abffbef4e01c92d4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-21 04:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 446b7c7a885c8a7dd8eaf1e38b2c22b7 SHA-1: 5e50fb363c224b364f3a6be8f765b2dd04af18c2 SHA-256: abffbef4e01c92d44a1581a56b6fb27083b607e956b127cb166e7146bd9df001
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://krukewittfarms.com/userfiles/file/vuzal.pdf
    • http://sourceandsecure.com/uploads/userfiles/file/memuvivi.pdf
    • https://rainbowprinter.com/app/webroot/files/file/66839786488.pdf
    • http://c2r.su/uploadfiles/file/2021090305192873499.pdf
    • http://mtcnx.com/upload/fckimagesfile/48270136210.pdf
    • https://mavachhaiphong.com/upload/files/97189431549.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/13486613521.pdf
    • http://slovbau.sk/test/userfiles/file/kowuzoxezedosom.pdf
    • http://goldsunjsc.com/upload/files/55633691172.pdf
    • https://powerliteaac.com/userfiles/file/jefemejerazaxaxupisisin.pdf
    • http://mskgroup-spb.ru/upload/file/47653584144.pdf
    • https://wotfiles.com/ckfinder/userfiles/files/65320769799.pdf
    • http://svadbavmoskve.com/content/xuploadimages/file/kivosu.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8be8a1cc---jufewonawowiluzenugilez.pdf
    • https://pacantioquia.org/aym_image/files/45264697720.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jhvunhqjnc4890v56sr5sfkn94/tabilemipulatexutamo.pdf
    • http://dajuicebarus.com/uploads/files/69400298799.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/81338661259.pdf
    • http://villabrown.it/userfiles/files/telugapos.pdf
    • https://kisikana.hr/userfiles/file/woworu.pdf
    • http://bresky.cz/res/file/41189625237.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f3e92ea6b---likabekemirugigav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wifi+fix+android
    • 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_off0000b2c8.bin
c5bda75d70a780fe5ffca4bf6c2d91e0dd152881020a115591a183a63fe6a910		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C8 16136 bytes
font_01_sfnt_off0000dc48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 16792 bytes
font_02_sfnt_off0000f45e.bin
ae7e15f3ff513e407d1de944a8ba3a1e88f550dfd0fac058a1a9a052e9fa8615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 9996 bytes

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