Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c95248efa19afb1…

MALICIOUS

PDF

96.7 KB Created: 2021-07-13 23:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f74eff0b3ff8fc76e9bcaa6a96df4602 SHA-1: 1102669db7e059bafc7fc3a322b0efedc7cf5211 SHA-256: 8c95248efa19afb132422b412736107cb0c08c1f3b0802efcfe67479437abfff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9404

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://coretry.ru/uplcv?utm_term=meaning+of+courageously PDF link annotation
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074cbc4dfc61---pigigebubiwazunobomom.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/mugamowopixugogodagil.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/uvffqaf8vgr4tgq6hv9s4lasu0/70572905980.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/garizikuwojafaragasu.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/79642370389.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/xetimudavowupasinekatikoz.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e1637142a36f02322c8f61408502ad6c/55016886171.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jgeqfpp0ahtjnaaqui368l2fc1/37995355581.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160721cb643a6d---26821078897.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/fff3ae5bd5638a285d031d6200ea25c1/ginifijexejibaki.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5a5913cb---najinogukisap.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/moniwolututaruxev.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfce7a7a55---totokilewejikobo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d811b678---2325460594.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/sewozovu.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/21446382978.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hu2ohg0c76dflu69kv9s4stc5o/6288972573.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cungnbcj432lgh9l42k9bbiv7h/28832770531.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd6b43244---95927662460.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/83176286943.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bed3c8cef60---84401596793.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08ef6582d---filuwol.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/92ea483c255840e1d1ca8dc4b984de1e/67449506234.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3a7a2166564cc5daf73ef54ffbb70bfb/rujosora.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/tagetedixufol.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/muburesosovuwagelis.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bef0ed0c---75243960399.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012238.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12238 19736 bytes
SHA-256: 8cfa216efe521781b06b153c8fce3fd546d551e0241f407f1825ad66de5316e5
font_00_sfnt_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 23288 bytes
SHA-256: d159981fdf3b3a47356bb3ca177c6dc83e66ef040580641d8ddf5b522fb561ad
font_01_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off0001440e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C25 10620 bytes
SHA-256: d4319cc0953b7a8eb607d622f20272b627857111a91fb82d21719e8de5186539

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