Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f0930870bae28b…

MALICIOUS

PDF

80.4 KB Created: 2021-10-16 03:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a4886b596c5b36139b78fe799fcd0697 SHA-1: 3fe13207d6bc4803d994fab0cfe5b3695bd2bfe2 SHA-256: 76f0930870bae28bd065398de6a79b6bf7cd9ae4ec3975830eed242037abbc91
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various URLs, including one hosted on a raw IP address, suggesting an attempt to obscure the final destination and potentially distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c57ce46e42b809e64ab070460919b1f1/53993612288.pdf In PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/75231630775.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/ravafemujisibe.pdfIn PDF document text
    • https://huanghecables.com/d/files/tudajitasetotuvipumidava.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/levuxenisa.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/90301006906.pdfPDF link annotation
    • http://nazycakes.com/userfiles/file/vuzifinosarotofo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7ab31733f---joruxa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4aae975e4ef2c001267522c699e6e19b/17256550065.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/71769156326.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/19846189811.pdfIn PDF document text
    • http://nantong.chinatupai.com/web/js/ckfinder/userfiles/files/gobitaso.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/bobiwipuza.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/86491420446.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/69182152877.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/regumodejejos.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/ziwotapazonudefipurozaj.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/3711250628.pdfIn PDF document text
    • http://mlight.cz/archiv/file/13842277194.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/basugezamatinej.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=gta+vice+city+hd+graphics+mod+download+for+pcPDF 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_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 17880 bytes
SHA-256: b2e57ee0ab3bc818c7d23a276127b9df97da78dc62bf97eab7a3d8d415751080
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 11372 bytes
SHA-256: f9923907a1f4aade4219a44f9c20aae9224864076fe261cf3bbd43a6ade01cd0
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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