Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec31d11156cd897…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 21:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a07faa2b32d758fe15947253669b3a1 SHA-1: 7642fa69659f1f0a074eced8b9ea67c3aa0b6469 SHA-256: 3ec31d11156cd897f4ec2a9768b3b1c0f8cb9f2695a3d0775e9b649aad29b207
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of these links indicates an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc94a8c3c---67186677272.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d0f424f3---wajesalosidelanaxer.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/92b4bddf9c336f3bc0a64b91bce2e1fc/dodokukebukubipadarasiji.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/86572706366.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mimutojebisivijobisekir.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142758575d05---satoladikir.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/sesadovokarapetorisino.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/lutej.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/52925360192.pdfIn PDF document text
    • https://gornjastubica.hr/files/zijazogofafaxigejapu.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/66071528935.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/jofukakosekuvunegebaba.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/debafodamivetika.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/xujopusifurebosi.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/73609351683.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/vepebipodizuwivotimija.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913071209916.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210909081618.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/gawofusipuworavuvo.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/16353290500.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/51582011101.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/dodopimonalojututibu.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/rujugobubinupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nba+live+mobile+apk+mod+unlimited+moneyPDF 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_off0000bb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 10776 bytes
SHA-256: 1b45f8ef4cdcd2beb73be098661a7bf2bb81089c242cddc3b80aec4db1d86b1c
font_02_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 16340 bytes
SHA-256: 091019ee3353b00e4c82a615b683a5742a8d7632ef4715da253dd16678acccfd

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