Malicious PDF — malware analysis report

Static analysis result for SHA-256 d029ed20190b67a7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 23:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a27ac6b7c135fe8b4569557a2dbb4ee2 SHA-1: 55b7038e88756f38c35296866ee1bd3358f33399 SHA-256: d029ed20190b67a709b5987a99fcc3e4783b1bb49b913db48200c95e8eeee1ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users. The ML classifier and ClamAV detection further corroborate the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=zynga+mod+apk PDF link annotation
    • https://cmoretv.com/userfiles/bixijorojenetosokuz.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906140235.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/rulizi.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///juvadifupapijopuvipoz.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/felop.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/gidafidip.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/pixowukiridoravor.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/baleziporenuzagas.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210908160734_d2Fsb3Rhc2F6ZW51amVzaXNhc3V4aW5hbA==.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/rejoworebevarunumanuz.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/11224356250.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/27918446457.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/sujudinivalimabika.pdfIn PDF document text
    • http://contua.org/userfiles/file/26413300108.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d17e64810c9752eec92419d37773b0b1/57008275695.pdfIn PDF document text
    • http://contua.org/userfiles/file/sarikuzevenaxu.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/fejatonek.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/zerinivulobo.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/39069574608.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e607bc62---32061027728.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/38c154d73f0f162b7e035e0f00f8e79a/derasopiwepedire.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/69791909698.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d8a8652e4cf833b6304be2b97c35abf7/20283886805.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/gitarobeviwadinipinowomi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 10268 bytes
SHA-256: 62a849d2eae89238f747efbdbe3fc6f7d099875bb1a3e15e8902718d0edae20c
font_02_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 17968 bytes
SHA-256: 5e809ab60d88bec8d52f8542694be2fbc2b0064f656d3636ec641a14f42f3259

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