Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa485893b7dabfb…

MALICIOUS

PDF

102.1 KB Created: 2021-07-03 16:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 217ac62d7f4b39c1db21f5c5118f0e34 SHA-1: c40f26a2d10657a58428ad90edd26cbc8bb96914 SHA-256: afa485893b7dabfbb4a3ea01e713f865b83836a89d27c90674b7deaf47f56048
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The document body is unreadable, but the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/dfb0f59a715deb6d2940ce8adc7c4ed1/zedofoworeresij.pdf In PDF document text
    • https://vestol.bg/files/file/gojosapexagegi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4oklibij7f459dq4n6p5q5lgn3/bofatazano.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf75cd3fd41---nepijikuvilojenikaz.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090714528f58---denuguzeposa.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c5e9517c89cb02424be8768598beba47/96980058487.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/33b920e63fba116b7afa0314089bfb89/mifagogebudufelobug.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acee768143---daketemene.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160794969aa279---66522210658.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3b5a9efc9f0b0ea4900564218101aadd/nuximixulazug.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/68809060874.pdfIn PDF document text
    • http://kelvista.lt/images/files/zogume.pdfIn PDF document text
    • http://megalaserasia.com/upload///44325689601.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d4dbc480c11eaf71d79b15e84c4189d7/mekowizugupumizati.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/wesajodizimebasidedemi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a23006412---67937993336.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/4a7122sivhdr8od14s4trpacdb/sudebawanafevaduzawij.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/862702c4d1b1bd944c8247cfab643d4c/xusakif.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160841cfd909c2---25896907439.pdfIn PDF document text
    • https://xigmatek.com/upload/files/26205936972.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lekimaganefimatojewapi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b72483b441a3230ebe7fcf1a2ab81f28/95909667772.pdfIn PDF document text
    • http://planbmedia.hufiles/basaxamivedofelifavedanar.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/34205553403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=riesling+cheese+pairingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 18412 bytes
SHA-256: dc8e71a75f1d1dc122d48784216907890095079f024b5b10d61433073c5fb6f1
font_01_sfnt_off00015b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001739c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1739C 10480 bytes
SHA-256: e79ab9e25327d43b899194f1115e6186a0ef92bb7b1f7b66df5e30d059b974ab

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