Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda9dea70783e6d4…

MALICIOUS

PDF

82.4 KB Created: 2021-07-02 01:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 66d500bcc0148056100e44eae062c80b SHA-1: 3de78e27d4e11a7a519dea805117e77146ce96ef SHA-256: eda9dea70783e6d4d9a7407e12faa4bbfdde778168bda22a8ad37d3efe13183c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://synerhu.ru/uplcv?utm_term=distance+between+two+postcodes PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb600ba4789---nisubonaberof.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bc237805---zamaxiripeduzuwedebuzaju.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b92389623---sidegibunaxijizij.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c9cb0e255---90740516202.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/wepujuwulunavuwozi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a3d62d75a---88044527459.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///81722375793.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa0fb8257---wifemagolirofaroj.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c79becddcdb4a1bf1f0b5c6ecacc4e60/87109033141.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cc7fe73db---27446278521.pdfIn PDF document text
    • http://getem.plfiles/file/75992139147.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/63f1bd2397d1683103947768114274f6/viwevuzinu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/084fd3389f5d0f9ab5d56938678b83e4/28264576643.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/fejipilodepixan.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/gozusewozogoneziwowopok.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/70244595937.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/mepemotugiwotorevoxeki.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c2a2e90503a210a1aa4d4590111e01ec/wonenutaberejudabefozo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/e0s61g3jnlvfno91pn66epj94j/wawonexipibefovok.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dfa63f874e8139879187e9ca9b115e95/mizoguzuxasepoli.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff57ee529---91194661651.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/26277982392.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fbfc2ffe133703863d543f468e734ec6/30466485819.pdfIn PDF document text
    • http://chayka-svg.ru/files/11440175715.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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 16864 bytes
SHA-256: 87e3e711d489f37ad6de7b3e3257d8506289864a3c81da50e524ec4dadb0c564
font_01_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 10588 bytes
SHA-256: 81f6016815587afe971f9b2f1811b39a64f2f9b9e03ad71b0b98bb1906d46cd5
font_02_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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