Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ecfa5ae466e3c0…

MALICIOUS

PDF

92.6 KB Created: 2021-07-27 00:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a68a9f2430c3fa75c611c821478d86d9 SHA-1: c73a381455f8a69740638407ef02d073e3f8a62b SHA-256: 39ecfa5ae466e3c0247f2af305819c7ccfabb86dce05a6c3ff0371078b00716b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links aligns with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a71e6e86168dd689718c6f0c0a35b03f/vodil.pdf In PDF document text
    • http://levakov132.ru/userfiles/file/penivafixujakunenig.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nudotuwe.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/kabupikexomezakideb.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b04c84e4cf---gagusadaxizitanir.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7a1a0fef306a6b280f3e24f9272efc4a/6158552353.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/77767856939.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2687bc52---nawizopimixipilaje.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/94685321814.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23db3d2e50---vufipojozipawawavevej.pdfIn PDF document text
    • http://cutskytools.com/d/files/84649542346.pdfIn PDF document text
    • https://viecmarketing24.com/upload/files/baxiripikokefugafizagi.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/mesituzafonorixugu.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/mebedijawoneke.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/6581802631.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d95cd7e024b---xurefezumiwus.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/p9p4dcoq1jgv1pkf74l8cekqv3/23520054939.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/eo9293kamrl5lc6evphjj5c4k1/supujasosisopaxiwunoxebeb.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2b698d18d8a75d695607d9a137d16778/patubetowemefifije.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/51253859900.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/26341e30e904af791ac42cfc74ce06e3/54926682798.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/sexilak.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/mpdsnhba2m3co5h0tdu5kp4jv2/79094799284.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/d685cda882be684c0970aaaa6de72427/zewezibazazibokejesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sims+4+november+update+broken+modsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 11056 bytes
SHA-256: a1004aa098dcf6ff3285c593be71e4ef64746ea213637a553519d0dd11c3388b
font_01_sfnt_off0001071a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 17648 bytes
SHA-256: 8590ed4db676dd84d62b472c9bfc4b2e5c77a52b12c2994a39fc8b986ed48168
font_03_sfnt_off00014b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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