Malicious PDF — malware analysis report

Static analysis result for SHA-256 916b2fb068de33fa…

MALICIOUS

PDF

78.3 KB Created: 2021-09-24 06:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f1e709a5e8d27a7be5ec5eacb9e83d7 SHA-1: 0d1a960b6c7527d66ed42d64dbe4a5f591c70b07 SHA-256: 916b2fb068de33faba207c961493fcb02d051aeb3c68170cf73366d00d056de2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the malicious activity, such as redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://mbamantra.com/ci/userfiles/files/34049044380.pdf In PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/mizabibe.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/66796060709.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/23263848126.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/2284924291.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/31090261524.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b492d872bf---kedomopisu.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/88130848092.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/80970441748.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631151264.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/89097259188.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/zafunudowakawamogesese.pdfIn PDF document text
    • https://o-dance.com/upload/files/wedegovonufawut.pdfIn PDF document text
    • https://producto.works/userfiles/file/wisis.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/bebul.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/faxuvigulazegatemigeras.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210919_FED59BC590660C19.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/37806658496.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a1bce87d3---muzod.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f18ab04f6a---jememebepo.pdfIn PDF document text
    • https://defi128.com/userfiles/files/10642761678.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/32429073776.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/68972070181.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/vetozaputojipubiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sending+a+follow+up+email+after+applying+for+a+jobPDF 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_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 17256 bytes
SHA-256: 2318509c973c70506e490c26d7ecac2d4f12feeaa22e28e4d72184b1fb7370a1
font_01_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 11316 bytes
SHA-256: 4b9fbc990e8dbc416a99449f3a1ab744fb7a2f7e25889f63e97516a1669e5f83
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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