Malicious PDF — malware analysis report

Static analysis result for SHA-256 190bf571ff013107…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 11:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c19e43821bfacd7af8170a8ad49b547 SHA-1: cff2fcc22eae34b5c72d15d75d03990bcf452d68 SHA-256: 190bf571ff013107fc27ae9dcafc25357bfc1795529e26abedf6df52dfe8eab7
172 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage or disposable hosting. The document body, though heavily obfuscated, contains indicators of a lure, such as 'invoice' or 'payment' language and a 'download' call-to-action, suggesting the intent is to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16108f5393a34c---ponememikegerizuzawib.pdf In PDF document text
    • http://mskabel.cz/UserFiles/File/23631114390.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db884449e73---xofizajabo.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/wozidusoletiji.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/74804696608.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/32512726314.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0cb4bb1f---12563198374.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/76982299468.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/labiras.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/12192730559.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611cce216869c---50625017779.pdfIn PDF document text
    • http://shopabrang.com/images/files/newofavezalotunutodolif.pdfIn PDF document text
    • https://x-software.cz/data/file/7046081785.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/luzodizo.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/tulom.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/86192220184.pdfIn PDF document text
    • http://dzbnf.com/upload/file///venalakem.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/22842414271.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/47158924475.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/ginoxobaf.pdfIn PDF document text
    • http://amdind.com/userfiles/file/jefowatusuxiwigitoxix.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/74606050995.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0488d44d29---97448609052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dpwh+blue+book+latest+edition+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 17556 bytes
SHA-256: f33f51854c3f2cd23a9f4b2c508aada637fa826ef25a9c3c54d0286d30e5b667
font_01_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA9 10912 bytes
SHA-256: cb56618faf13768e7ce83d0354a0597ed43caa7e31db988e9f0ca3091307b668

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