Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3d107e15d8a7dc…

MALICIOUS

PDF

111.9 KB Created: 2021-07-03 10:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 16eb99ecb9f44d1623906ee92ba8505e SHA-1: 4d5a480ac994a46069794c0d30656fff711a5ec4 SHA-256: 6c3d107e15d8a7dc786a6ba9ceee1d1ba713d3dd964faa1de99fcbf907850d52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, suggesting a multi-stage attack. No scripts were extracted, but the presence of external links and the 'link farm' heuristics strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=anointed+meaning+in+english PDF link annotation
    • https://bishopsalamatkhokhar.org/userfiles/file/17848366170.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/r5h01dilhg7brfq95cg9644ptv/gomumalulofejerokibaga.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/zetumabenunudoliduzojor.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/babovabe.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/kapag.pdfIn PDF document text
    • https://efnnma.org/files/file/38327652706.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/34b996c0af2ce5c9f175adae21986a0f/nejedafanuresedefin.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b848bee9eefb1d5f197d31a3cc1d2d4a/51072260770.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160807c8b5379a---lilijajawuzajaraxolok.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/wufebapusizu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a21d7fa4---2071845393.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/64931078457.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/61839866778.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/99934866400.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074468fd3756---vejer.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/30640501119.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96dc417c41---gopalegifafuladolinagu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/h8f5poi77k59ii30bnpapg0g44/tapap.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddcfea124a416cf91b0a87a219984319/jivagaxizekanezenuzesixem.pdfIn PDF document text
    • http://hncastlecable.com/d/files/supenosiles.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/78de05dd67a229926015995a7a6d834b/nuxegapilima.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b462dcb76c288fbc6944082d3c82b784/fowejoniwi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 21460 bytes
SHA-256: 87ab136fc3569c2a181482cb07932e12a80db075a4f5ac7b32af242de3d82a6a
font_01_sfnt_off0001629c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1629C 18964 bytes
SHA-256: 43cce4c4d6b62bd71c8c0374e84e2b85f8d45c219d111aa844db7dc94f759909
font_02_sfnt_off00018231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18231 10576 bytes
SHA-256: d6d51582f57b5c49a6ec17af41ead8a122e4edd79926888191fe7b8c0e4e87a3
font_03_sfnt_off000199f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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