Malicious PDF — malware analysis report

Static analysis result for SHA-256 d238c566f4dedc2f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 09:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 111597d51037703be9301702eb4a9d1d SHA-1: 821b500a30d1a61d5bffaf2fb04060965eba764a SHA-256: d238c566f4dedc2f9ec5657aa5e2f526db761d7ce0bc6602bd8a46133ccd16da
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The presence of these links suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to serve further malware. No scripts were extracted, but the overall structure and URL findings point to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=physical+science+pdf+download PDF link annotation
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/doponuwotowidaxoxe.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9375c8ff1---vukageredudazofek.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1503979b---boxigirexenejopokazir.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d247fe7d662---rivuxiluvisoduruxugu.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/61532206147.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/nikujojazisaxevosutavixe.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/28bbf38720da61084f085813d431da5a/47871057477.pdfIn PDF document text
    • http://thongthien.vn/upload/files/pufotobane.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/90268996581.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/gagelakaxinedegemelukat.pdfIn PDF document text
    • http://uci.ir/userfiles/file/27030745141.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/33718185285.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/83b159016302399772c150b1c64cd795/68365544798.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/davakakosi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca45b683e---zepatot.pdfIn PDF document text
    • https://tavio.ru/files/file/pekevoroz.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sitagiroropezadovom.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079bbfe0cbbb---84345119682.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/tebosovelojomudane.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/54277033672.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/25d38dcc42d56178613c73c5202c76e1/gawagafetegoruzem.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/mosenir.pdfIn PDF document text
    • https://scalper.ir/data/files/file/pegegazemuwepupodog.pdfIn PDF document text
    • http://locke-3c.tw/uploads//files/202108100116471882.pdfIn PDF document text
    • 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_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 17472 bytes
SHA-256: 26a0d3d0856544d3687a5895dee59d2b159910b31e10e3ebe593b1a384a7dc47
font_02_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 10720 bytes
SHA-256: bcd3d83616e7568f09ff153ed6d8ad1c310d0150c0b36508c4c7bf8f86b2e5bf

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