Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d45db6a5a0f5ac…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 12:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 793c4d76fe166ea731674601cbede7cb SHA-1: 1d6f5d61ba526856523c9a1fe91b3d7a49d09e84 SHA-256: f7d45db6a5a0f5ace1e4a4603152c136b41cbafcc90accc7828c56b498b8b58c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=gta+vice+city+save+data+android PDF link annotation
    • http://cuanhuaabshanquoc.vn/files/lewofamepipiromirufele.pdfIn PDF document text
    • http://lonsdale.ee/tipikas/uploads/sisupildid/todibepef.pdfIn PDF document text
    • https://duel.pl/userfiles/file/roxod.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/83727114036.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f202fb60---buposomukolikobax.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/kadal.pdfIn PDF document text
    • http://knipia.com/userfiles/file/29273696991.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/sawarinudup.pdfIn PDF document text
    • http://ingore.cn/upload/files/8932445647.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/35715792642.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/9197509030.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/25300562617.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/63839803565.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/beliga.pdfIn PDF document text
    • https://linker.tw/files/34548809213.pdfIn PDF document text
    • http://vo23.ru/upload/file/rerigilinafegirut.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/h11ie2u9n7kbsqh1anho0frtv3/65281104148.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/23725591319.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/35136884719.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/48259257438.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc004aa659---zusisimixi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80255db38---genitapezuturopag.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/fasukaterinadopopunarepex.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_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 17980 bytes
SHA-256: 32edbcaa13c2fc9e92e98206257727c1635b1b5f242e46093b901333de2b9b17
font_01_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 10536 bytes
SHA-256: c7bc624aa55018355fa17c941ba4a40faa974100f375439bb4f7446a21e86ad8