Malicious PDF — malware analysis report

Static analysis result for SHA-256 a666685e50a35558…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 13:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18a6dc4129d82302c89d1a98ec62b28f SHA-1: b0fa1ccad1306746337b7f17898b3912df097454 SHA-256: a666685e50a35558f5f7986a7812b1c9f9fc043aaa0a7dafacdaa8dcff38ce19
124 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV with the signature Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0. Static analysis revealed that the document functions as a link farm, containing numerous embedded URLs. Several of these URLs point to compromised CMS upload directories, indicating a potential distribution point for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3747

Heuristics 5

  • 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
  • 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 http://bioscipublisher.com/files/upfiles/file/61961724903.pdf In PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gufimurezimarokazam.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jugijomelifatuburogis.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lonepazuterataja.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc0ff4bb6e---zunawosokerobepevilimine.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/47775666013.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/47513252140.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109121302374618.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4s9gu8kitf0n50n6pq0h63bs63/fudirotabakiwonebi.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/foremufedigamazawanas.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/20f95b919e4085236d7926f66e43b143/1527902382.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/donalotawuv.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/42794897494.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16141e7ebd19e8---28503225798.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/3291376165.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/bukup.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/73309375490.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/kukone.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/xotirakorusaparulazokevuz.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/lifazenuwovepufusi.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/xerokosupuwukodakusokaz.pdfIn PDF document text
    • http://trieuduong.com/images/Download/35415374126.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1be639e1---mikopusexajebevumimoxep.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/59188270034.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/riwivonasabapixagalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=car+simulator+vietnam+for+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 10572 bytes
SHA-256: 765e51e6bbcfa50878f6a1c8eb89cb0b79c1e1d5e97b0b1c83ac34ce13367926