Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6535dcb2779e44…

MALICIOUS

PDF

86.9 KB Created: 2021-08-10 20:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed25ce2859f8fc9f2d50027a461921c5 SHA-1: 87e9684fe03e8681b673912cbb631fc253559a96 SHA-256: ed6535dcb2779e44ce67b19dfec604f8986c7f8c92c5a5316bff5032a1584c8e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution. The embedded URLs are the primary indicators of compromise, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc60a8587---xobilokofu.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a1fe2e717d0cf05b55a75a8669aae9a1/wasijobupanasusuvi.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/webefaraparomopufos.pdfIn PDF document text
    • http://altinay-law.com/images/file/figexesujesizufibe.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/porirevaxiwa.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3ed0af72d---98576615373.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/22197836974.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/vebusamofiwef.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f89e4701177ce0a78a40dd4d6f0c4982/63938904388.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2ba9fb361bbf3d63ae18899b27fd6406/nipuvaguzezadib.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/vorib.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084783e8d7c5---jimaviwomamadasof.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e68b1bedec7acfd297abc324bd357702/86444534147.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/52714569631.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/gevi4b7bocq3c29c9aag2q62rd/3303366452.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/dagasafad.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/58488370070.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f7d464e4---39840016232.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/97257792772.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210802034233.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/65563247129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=que+significan+los+simbolos+en+el+tablero+del+carroPDF 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_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 17116 bytes
SHA-256: cf06f9feb29b0ef27cef629759f991cd51b5c30a5aad9378f22efb0293d0a138
font_01_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 11116 bytes
SHA-256: 32648ea1efb026b6285164487ec4eb6a456740627a357922b363b8fa70140f0e
font_02_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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