Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0789d1301382d53…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 17:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa133489989a6009ebacac28ca4fb0e0 SHA-1: 7e62a49507773ad2e57429b5a571bf5d5ce5d2df SHA-256: b0789d1301382d53d320e2e71fabc88cc9cfef12cb90af9caf4a83cb94fe2264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613144b35f5b9---13759167994.pdf
    • http://pileshoppen.dk/userfiles/file/mulizimude.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/22078975264.pdf
    • https://motty-etai-sharon.com/files/files/63674429627.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/tefemup.pdf
    • https://mimpishio1.com/contents/files/83635629806.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1e4d3127a---sisaluzivotusavowifo.pdf
    • https://lenaoyunlar.net/calisma2/files/uploads/87924176984.pdf
    • http://iranjobex.com/cache/fck_files/file/vibabaveramubalibu.pdf
    • https://betentour.com/sites/default/files/file/lokagakimim.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376ccaefec9---zalolusarodi.pdf
    • http://zezoalza.com/ckupload/files/15086711661.pdf
    • http://www.rupankar.com/fckimages/file/gemezewepurejuxizojabi.pdf
    • http://wefocusdesign.com/upload/files/48503103214.pdf
    • https://rentcar888.com/uploads/files/202109240436092994.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/54525881449.pdf
    • http://tuclubcr.com/campannas/file/18951916695.pdf
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/gojut.pdf
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/gevuwe.pdf
    • http://zhatuogz.com/uploadfile/file/42779201529.pdf
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/sarerokikibutagiwawurokif.pdf
    • https://infoenergie-loire.org/userfiles/file/bilevepubeke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+showing+pending+in+play+store
    • 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_off0000af86.bin
c134811bd7ae146d060b6a9612f296dc6a193036fa901d608511ab575aaee80c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 10872 bytes
font_01_sfnt_off0000c870.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC870 16792 bytes
font_02_sfnt_off0000e082.bin
8577c72ce27d15235355c1c322aa5714c4092b755e45872841e0b37c3a1a71cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 16504 bytes

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