Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec3f5560548ded1…

MALICIOUS

PDF

88.0 KB Created: 2021-07-08 22:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 12791a4495309f88764b8cef1ca30cb0 SHA-1: 7b2fef97bca18772d0dab3fc0d658776ea54aab7 SHA-256: dec3f5560548ded11a0aab269e43f81f9372d2cbc9d5fa054e830171f1661626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for SEO manipulation or to host malicious files. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=public+places+to+go+fishing+near+me PDF link annotation
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcddc69bae---gaxutoraloborusid.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/80551961618.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cb7dbb05---91436436172.pdfIn PDF document text
    • http://aplus.to/userfiles/file/kijewemubox.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/k2ilhvhfp77pahoccl8gspq2cn/14747292348.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/fazudeni.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/slg4gc0ul953te1o66aongkil5/zavibujebujefozizozak.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/43779919301.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/dbg6ol4kcguf8c2ekcvg648933/rirefawewosipiz.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/tefigozutigavevok.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160875430dfc5f---guwizufozevevuga.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab932c1c06---1618612461.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/69408730c10eaec088cade794c4d385f/pelikunirif.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/xurezilezoramatineko.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/88669870936.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/rodupogowilopagam.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160786472ae717---sexosekikapovotud.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/88qol5766mhr3uvef28ftmks7g/mufemuj.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210703134755120.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/81519482422.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/35702521857.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/rewuxagebetetepa.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/24817382354.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e395c8a5039f092e117d92efe29d8967/12511799796.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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 11168 bytes
SHA-256: 77915b816cb271121947619518b72c6fb342798f1faa7e390d09da0c8e56823c
font_01_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 17044 bytes
SHA-256: 67aa84bc389191fcdd439a68da06b796ea40b3dd9e993eafef31e08ac26e10de
font_02_sfnt_off00013a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1