Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b7ecdc3b33924b…

MALICIOUS

PDF

88.5 KB Created: 2021-09-20 02:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dad36629b6de4b6fb33f004bd46a5f86 SHA-1: 2d0f7bbca0520d80e0fae4be4a7ee4e9f2d91108 SHA-256: 18b7ecdc3b33924bccf8d240c4b7c1744c16a7540b47a92a6fdfa3b4cbb2d3a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vildmarksjagt.dk/userfiles/file/78433450751.pdf In PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tagaxavuvekutesoduz.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210919121701.pdfIn PDF document text
    • https://ratoempat.com/contents/files/35991589698.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/39113382683.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5098705ab129c0903a841176a7203d92/miforiwaxezelibibajiwizis.pdfIn PDF document text
    • http://gespk.com/userfiles/file/93409382818.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141c181a2508---jatewakugasaxufelutes.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/magazotaletozezofomigorof.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdce211ec5---robefo.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/dojusuxijuzi.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/35619171176.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/godiraneditewixubokusoru.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/39684936408.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/80703865804.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139431909de2---72680351345.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/g5eassnparno8d26bkif7q7ovm/19145358276.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f6ea7248074a7932c04ef3331656030f/67138544836.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/1248523557.pdfIn PDF document text
    • https://riwg.in/userfiles/file/semasitogad.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/desarusixuvaxolawu.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/5751099636.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c37388b---51985054544.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/83114475742.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c686805d46---xamepisovufiwesumibolofo.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/borozegetufabedoxewexejes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=watch+harry+potter+and+the+goblet+of+fire+full+movie+freePDF 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_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 18564 bytes
SHA-256: ef65e76134055c1abb141ce4cd8e2d19ff4699fb009b96837651c30b4aa285c8
font_02_sfnt_off000139d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D6 11312 bytes
SHA-256: 12367f777340eb1789b2674ef4c5a3ad1eaa8b30368c12ad59741ae9aed39ab9

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