Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec04c07a19ad079…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 08:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 96e1956a721d2e2aef5871193deace63 SHA-1: 0cb6aca00012b083aff89daa89f56296952aa2d7 SHA-256: 1ec04c07a19ad079e2b5e958913615b72607f837a9e712d775f5b02561b159ef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lutechmed.com/Images_upload/files/jezinofopejidimomuzon.pdf In PDF document text
    • http://beijingbeat.com/contents//files/wuvuruliluwadigavageneko.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/tovazutibuvulagoneve.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/90638573593.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608365c700042---10061381025.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/48809069390.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8a4ffe268b5c052ed8c6c916de0c8ded/48945081176.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/nosetogipexudez.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4onopjt2arhqc3oikmqt4g7ubc/nezuf.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160701cc7c8e55---dejarelipum.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/60048024532.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/65224082621.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a7426cb3---pizoduwobexix.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/filukegusepusisanuzisu.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/66748146332.pdfIn PDF document text
    • http://lyshiying.com/d/files/57807270928.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/db418090c0201fcc429d09123cad717a/53768131258.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828edf9b6d7---nipubalajuvijun.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7e446e2f---nebiparezenadesip.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afabb0bd279---xilovafolifenavafej.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/93450686632.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/71036549815.pdfIn PDF document text
    • https://patc.fr/imagesfile/tuzipu.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/66679644583.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/poperumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fundamentals+of+heat+and+mass+transfer+8th+edition+free+pdfPDF 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_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 11048 bytes
SHA-256: a71fbb19bf6b12923ece3c30fee5b885ce11e32c3d2515fa14c14b2ce4238968
font_01_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 17004 bytes
SHA-256: 1c8b92e3e8d696bfecac5f7e75fd17a6d94562bb029517da821ec9126ed6c1c4
font_02_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1