Malicious PDF — malware analysis report

Static analysis result for SHA-256 b915b7bcae24bf25…

MALICIOUS

PDF

81.5 KB Created: 2021-06-25 12:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8111661d8ae0155386dad929b1877bf SHA-1: ddfee5b0ad5b03a592304fa8223a8a9ff2c92669 SHA-256: b915b7bcae24bf25815b126c64590a2fa903370ae676111db882b8c758e30fe5
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This indicates a link farm strategy designed to obscure the ultimate destination and potentially distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/le28ruumgp67k7i6au4bffluo7/49887556199.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d8f0ebc7a---gemulosibufonuz.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ec19cc64---nurilogimola.pdf
    • https://fontaine-eva.fr/userfiles/files/magisipevakutuvutedibife.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/a36e62fdab0b441721a6c125de520d17/19810429840.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94dff09beb---pukoronimujulokakap.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/dab96d8a485755b97e3f4c5f1876251d/wolukapupelikopa.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb575ac88a---pamidituregal.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/97eu7v21lq159c5ikm5ev6hojb/79309555944.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ajv9tt40ajh0gnrj0nhrfd0g70/jarifozijoladise.pdf
    • http://www.parinet.fi/tiedostot/files/wagikimoxirugolejigefiba.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/40b18ecabf47a7d784988a97b3707227/kozomasajepenen.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/9296823438.pdf
    • http://dmkaudit.sk/101/upload/file/97541564334.pdf
    • https://thietbidiensino.vn/media/ftp/file/39870179603.pdf
    • http://blpest.com/UserFiles/file/45744484267.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kg+to+cm3+conversion
    • 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_off0000d433.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 16792 bytes
font_01_sfnt_off0000ec45.bin
1fa5388d21aa219ad44735fd46a2a0a99de795fc144302557cfd5a30c4413570		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 19360 bytes
font_02_sfnt_off00011fb3.bin
c14c7a1875b1cead34bd4b15fe78e3e280faec111d740690aa51a502c0a73156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 10592 bytes

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