Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5e784c8e7ee39b…

MALICIOUS

PDF

83.1 KB Created: 2021-07-10 09:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea7eba9ad36461eb2e751ac234a7607d SHA-1: 59b21bace23e68f04a3e943847911eb82e80b8e7 SHA-256: dc5e784c8e7ee39b3e3a35e16a20cb403f9bf62e75ecb53e2e7175f80b7a8a6b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://ferdavagnar.is/images/fck/file/litasotuguzabanira.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd15ba932a---53777800956.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b742004fb4a55d60cab9d657ef44dc38/35675501856.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/01ef7b6c4d171fd42e0d7bab46d609da/febokebok.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d850369c0---motunuxufetedadatobewefi.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa48ccc4738---3495132412.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/019c0e15b8a084151314955148f0a8b4/zedipamixilalumisawepuju.pdf
    • http://gndpta.eu/news_objects/files/97128257780.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ebr6iilcoko38l4j72h7iaib3/61029040402.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3a0abfc8fef246865990a703696f3935/zoler.pdf
    • http://4bx.pl/public/file/sivewemedijurivasezudukaz.pdf
    • http://cnc-soustruzeni.cz/files/file/28579404154.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be53ce7dd67---mavuwetopupelulekemasuwij.pdf
    • http://www.contectrade.hu/fckfiles/file/ropipegupeveripatose.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/974f251b25f7e7a481692b6db5a23c16/vujuwogegikiti.pdf
    • https://brianhigbielaw.com/UserFiles/file/39733469913.pdf
    • http://dvarenda.ru/upload/file/1673579133.pdf
    • https://lawina-radom.pl/files/file/42268838382.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6906a63e37f26dba0bf8ca083566066a/71498766048.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d73bedf10---5320332877.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b97edd29c30c190c0f021acee2a5754c/59719670581.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609820a233a11---tipegarutufezipi.pdf
    • http://lapawan15.com/shop/fck_file/file/71043941775.pdf
    • http://benetalent.com/upload/files/kurokemej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chapter+12+section+1+dna+the+genetic+material
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e188.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 16792 bytes
font_01_sfnt_off0000f99f.bin
6be8a6681decb84f1316abe14672764f20ad0fd61b4e52333d380e3a9fcb8bd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 11164 bytes
font_02_sfnt_off0001136e.bin
49011ecb5235110aa8359953ca06f19edd1786b853f050d06f442f6c91af038e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 16648 bytes