Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0de93488b2bf3a…

MALICIOUS

PDF

89.9 KB Created: 2021-09-18 14:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91991e8c26bd618b0ad7efff08f19026 SHA-1: 3bf79f8e701dfaadb393a22e9ccd1a2a73face43 SHA-256: ba0de93488b2bf3aec9e64fcbcc0ee87cc688013e85fa9eab25fa87c71bcb9ee
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and the extensive link farm suggest the document is designed to redirect users to malicious websites, likely for phishing or to download further malware. The presence of external URIs pointing to compromised CMS upload storage and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=famous+first+lines+of+novels PDF link annotation
    • https://alice-immo.com/userfiles/file/bojopirun.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b1f345cc---45594977887.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/95463405619.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066522e7ee---26615913494.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/sigiwejozok.pdfIn PDF document text
    • http://tfforming.ru/d/files/10202116006.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/tobolusumakiwakumamu.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/rowojivawopidarug.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/76723090125.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210904050148.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/fabel.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/41759503128.pdfPDF link annotation
    • https://branchennachweis.eu/userfiles/file/33255355591.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/sewojepeto.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/ruvifoge.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/putifudag.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/2254647163.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xilujumatusegaximel.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/69623150093.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613717dc6fdf9---64020692241.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/81542245782.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eee49724f---17901419541.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/85762546960.pdfIn PDF document text
    • 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_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 10520 bytes
SHA-256: 57442279ec7aa2d745f49467e6af0b52b36731ca97f5322db5754b523e290656
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 18848 bytes
SHA-256: e54a09d1ce8259a29594cd6a7df03cba484c2452f06e2c93e4fa01b03af46583

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