Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb182be93a2b7cf9…

MALICIOUS

PDF

115.0 KB Created: 2021-06-25 21:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61c37ba43fe7a64d7b1e3439aac8674a SHA-1: e711310b0f198aaa65489e33175e69d00e181196 SHA-256: fb182be93a2b7cf946f72e2ee692885836c478c1dfc82f22cc715e0f842bdaa2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to deceive users into fraudulent financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5207912a27---girorezokaduzarolojani.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02362f1707---11270909561.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d208999a8d9---tuzekak.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7466cee1bbbbe0819fae116a9947d194/wosutelisawuriw.pdf
    • http://lezeckastenakosice.sk/upload/files/xubumurem.pdf
    • https://batikatravels.com/userfiles/file/84811828741.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/12741c62c36bffa724b96eb35c6748c2/17725191658.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4c1976c2c2e87f5897b25bd4d1321749/58029812301.pdf
    • https://coil.hk/upload/files/24566510050.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bbeee6ae929095a7e264d7bfb6ecf014/64097614676.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/121f32f21a7271aca393124290662cb7/71811362354.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094753c4b90a---vefesovuso.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/k1bqo3n09oj2phl27kadfndap2/84142423394.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db31679385---96877284036.pdf
    • http://vietkinggroup.com/uploads/userfiles/file/53582754708.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/defasefoja.pdf
    • http://hb1004.com/userData/board/file/96019450730.pdf
    • https://bcbc3399.com/upload/files/29094334122.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b25da6c00---xofozixakokefizisu.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbfb3576c---45454835128.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a1ac9897---75146008161.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1734ca17---bovixugo.pdf
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/84721494504.pdf
    • http://budohurtsa.pl/userfiles/file/97438801655.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/5b6727dc9dd782a2373ce765d8b2b566/85648541686.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5fdb65ba---97073554811.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=apa+in+text+citation+3+authors
    • 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_off00015f09.bin
cab392da59a1830984e9aadbba7c95a76680f540a13c8f70ef4310c81b70cb5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F09 10780 bytes
font_01_sfnt_off000177ed.bin
ad663b2917120d35ce2a88a48c3aff8e09a88280ef2953981af6e323e8d93996
pdf-font-stream PDF embedded font (sfnt) at offset 0x177ED 17712 bytes
font_02_sfnt_off0001a641.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A641 16792 bytes