Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a58578b2525d41…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 10:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0bec8db48dd51345b08faf1445b73bc SHA-1: 4f624277ea1233dd7d097c7eef43be24a87af877 SHA-256: 15a58578b2525d41686e181069729ab48e8cca930578601f3180239a11e356cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://artcorner-fiberglass.com/userfiles/files/wubixewisiwibupozodizajaw.pdf In PDF document text
    • http://pronobile.com/catalog/file/28680109829.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7375d212ec74dd6a267808e230606029/13418333682.pdfIn PDF document text
    • http://metzlerranch.com/userimages/temawuwupajejagana.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131641c0fbd1---vodatugalezux.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/tipapalivosatipopi.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/naruvosuzumikobegi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/060b3040822435421ac777803978fc37/89430777156.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/90520873783.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xuberoretatenewemovefa.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/35053416678.pdfIn PDF document text
    • http://christopherdallo.com/file/porowokigajivabawapuxagos.pdfIn PDF document text
    • http://fteq.ru/files/file/wofopaxod.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc5b0884a---lorisusuvejavebibev.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/51046060679.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/92360774861.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/wupifatuvililip.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/xunanosufavufimudijijimu.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/kawetolimedabarawawa.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/nafiwika.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/nowisigulukitimalarurupi.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109020359463054.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/66515519188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dream+league+soccer+hack+apk+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B9 16508 bytes
SHA-256: 3d8430424154d5dc2870e4b8d0b31a0bd60eefd4612053f6c9f5279f46ad7398
font_01_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 11048 bytes
SHA-256: cecd4527dca084d45f48f1b1592784e14411c8df550306bdb54aaa1b37b15677
font_02_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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