Malicious PDF — malware analysis report

Static analysis result for SHA-256 a151be944ad69aeb…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 16:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a75ffae9303cc2701ff31898c789e2b SHA-1: 165722e5b1afd32fc2a489db17b2bc779a991dfa SHA-256: a151be944ad69aeb959bd565114f7501bf1ed29a3b9b085b48749e54422d8bfa
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, with one URL specifically mentioning 'android esxi client' suggesting a potential lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://queure.ru/uplcv?utm_term=android+esxi+client PDF link annotation
    • http://lepal.sk/ckfinder/userfiles/files/87047565632.pdfIn PDF document text
    • http://freetds.net/userfiles/file/gojorosugibopedamowusi.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/24844579112.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/mozatebexazi.pdfIn PDF document text
    • http://tavio.su/files/file/85605353933.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/lebata.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/96646440178.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/99299691959.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/2448295725.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/zarojekiwokozabipulolasi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c115e8235e---ruvekuz.pdfIn PDF document text
    • https://coevent.ru/upload/files/jumon.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091716593373499.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/21838520579.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115ecf2370---gubipokogabokupubot.pdfIn PDF document text
    • http://bushurov.ru/images/files/ginuzoxaxibojaxagusesa.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b40bfda20f49817e74d5e99f6cc30d04/tetubidi.pdfIn PDF document text
    • http://qdcmd.com/data/files/nonuwaritofemex.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090708511524.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/8054062878.pdfIn macro / runtime command snippet
    • http://pro-group.ru/userfiles/files/jumuminet.pdfIn macro / runtime command snippet
    • https://k85shj16h-561lt.com/contents/files/lupufurimafudosabutuzava.pdfIn PDF document text
    • http://sb-78.ru/files/file/16512361174.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/17667683520.pdfIn PDF document text
    • http://snbedu.com/uplIn macro / runtime command snippet
    • 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_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 18372 bytes
SHA-256: 0209a9772b83c556a776fc725978a85f8816badbb1ca284ec0cb362fd510d78a
font_02_sfnt_off00013312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 10284 bytes
SHA-256: 8bc3d41804f435095e2ef2f43ba9d11c9a44a8c0f63de9b33d4810cff805a001

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