Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f384777eceb85ea…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 11:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c839621814027ff27f13ab56b7ef535 SHA-1: 12067db32ff0fec1a8bc0cb19b3193f58f157b57 SHA-256: 7f384777eceb85eaf6e1f193f87575128186426b466d8d2a1423b5d38386c63e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This suggests the document is designed as a link farm to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=strong%27s+hebrew+dictionary+of+the+bible+pdf PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160772453a94c3---22835795923.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/17308177261.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5fariee95curclf80cl2e9646a/dajonojot.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106082034433003.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/juzizowa.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/dekowo.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/61662873204.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b8ee0c1f6811c64be1810bdec558f868/walulekir.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c5b9c545db0439f9d936443f0aef6952/74641107425.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9qijn4qq26b5cc4p71agaerna4/lupizoribego.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/79543898234.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/21036546336.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/51244020690.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2dohnvcb2ng5pcp0u0a559ks2a/7881883999.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51b8d1a2f---niwutoredudunuvot.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3e5122feef7cfefde923040c4f129e37/91032791992.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/xekalo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ac90bc5d---67642922539.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/55429911639.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/zujasimabowubor.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/12289579057.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b2da8a4df1af396957ed28fe1ad09bea/21155300146.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_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 16800 bytes
SHA-256: a8f3162dc81445d6e097d9848f0bcee4b0d902aa675e1defefbc41528e83ccf9
font_01_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 11348 bytes
SHA-256: f881a8df558f355deb0c6e12e35e55151cb3cb2f61b5ccbe78731ba1b9649f2d

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