Malicious PDF — malware analysis report

Static analysis result for SHA-256 985db352fc32e273…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 02:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95f667f0b309b71eba8bab9f96e56392 SHA-1: e782f361c2183e2e9791a877eaceeb2e8bcc4484 SHA-256: 985db352fc32e2730fdafca2021fb75bd5be85444658b1ee6a25e28e584927f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link farm.

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://dobre-akce.cz/media/files/file/ketizaveg.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/345ec3ee9c4f3a129680eed703e68679/45465278519.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/zalezibuwisinuze.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/4571d41fc725a3df21f29b4e2ec1ebe1/34368089146.pdfIn PDF document text
    • http://yongqingtech.com/d/files/42105743125.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/65102614975.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/69725923187.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/lepapujususofos.pdfIn PDF document text
    • http://balone.net/_upload/file///dojawopinetepatujupizaxis.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/bozoveparupeno.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/61080360117.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/arodfaap64efvi6f8v7ugjmfnr/15319519856.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/10898331506.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609828361e960---mefuvodoxevun.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a3d5e5ff81f4ed5dad342cd7cb9bc208/31942770041.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/bifono.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/goluderudu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f6fae84d511498415edc35e1e838f274/74242339076.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239326e682---dikijebaxalegewokinib.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/68568423582.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/zazurebukin.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/44560884863.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7752e2d944---38102572132.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/82951648180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fpdf+multicell+python+examplePDF 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_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 17664 bytes
SHA-256: 64d2e6412bece6b14b210499e4cdd58e3a16b82d631bf37ffe452447f73b0255
font_01_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 10908 bytes
SHA-256: 1b403bdfe8dffabeaa2b0098902a916e23b6f8efa826123f9aaa764ebbfa767a
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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