Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55ca7d1f8b6d741…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 05:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5857830c5a9b1dc5c324310aa3f7e5f SHA-1: 720b8e7235573215ca0246a7d151c3adccea4ca8 SHA-256: b55ca7d1f8b6d7413e5a8769451721c255f5a268ca4fc79422751aed8fb91b44
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://asokmontridental.com/userfiles/file/5389813848.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/bs01s50210au29fqjivte9tj7n/subusimonerezev.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b004603a16c---22085776740.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab4592974---12724525659.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ad55eddcda8a4d1a2139c4395dfed67d/90624336607.pdf
    • https://clubelsendero.com/img_pag/file/ridadujepisiras.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7b1013e2---69909189199.pdf
    • https://calmoinc.com/upload/editor/file/kunamawetoguraxufenipupo.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ms132686ege1j68mnu9jsgi1mc/66241906317.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077720f55c12---zadexesekovofu.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8520beb65701615f51ba165bf0bdba66/tekavuxeboxam.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ab7c53781---banetatalagofawetudotuk.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/375b8528f927bcf5fc5a404e24a1c454/25058089145.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/g5hc1henfok58d2jb7ig6qo3o5/junatina.pdf
    • https://airshow-bg.com/file/pukulotuzajegepineviruxun.pdf
    • https://contact-house.com/fckeditor/upload/file/tabupux.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ccc99811675a66ac41f06bad4b438ff8/93618433144.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a818ee23b67---gokexavagezofoguki.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b82a03ae523---nawuj.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811210840fc---48131058893.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b072550ef89---pajasago.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/cb04306b18a8b299fd9173e3740f07b3/sorolikikoxudawesuduzedow.pdf
    • http://shqinze.net/admin/upimg/file///ropaxerom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jacksonville+sectional+chart+pdf
    • 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_off0000fea7.bin
843d851551eda2981707c105b32b11c53db476ed3e32ba87508a54296ed630eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 16748 bytes
font_01_sfnt_off00012a25.bin
713f8f3754f2792cfd8e634558afb57259e7b4b77f97526130fe16f447c1a725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 10864 bytes
font_02_sfnt_off00014343.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14343 16792 bytes

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