Malicious PDF — malware analysis report

Static analysis result for SHA-256 28efb13812e8bd69…

MALICIOUS

PDF

80.3 KB Created: 2021-06-29 23:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09fde6332472c64b71a4b1207cffda27 SHA-1: bc0b136faaad3bc01d22cb4e4ffee21bd8a89977 SHA-256: 28efb13812e8bd6922b804fc97a7411e9e05b1608cd4da77e24983e583ad6569
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of 'SE_PAYMENT_REDIRECT_LURE' and 'SE_CALLBACK_LURE' heuristics suggests the document is intended to trick users into believing there are payment issues or to call a fraudulent support number. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=one+for+the+money+series+in+order
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1770dce86---40370004703.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638d55eab0---kijejotavefivo.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608173de0c22c---tipalaxaremevoj.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/44cf14cea9d9a11ecca03b770eee0663/faser.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ef30jmhgtv66gcjchbe68cd57p/71901119847.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f792f011---66675758381.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ui0r4utbqjjj6jpmjd4abtllop/juwisukokamuz.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca98335c1e---noperokurenotonufilawo.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2a5ae578aa801a31d1658f2558b091f8/gumetulowosepoxudemu.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/073f1adb0512f3571e98c169318d2d74/41850395768.pdf
    • https://nepalaviationmuseum.com/userfiles/files/55568296571.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4nkuc42q3j9r11ct8p8t4io42i/58077217516.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094409c64e25---dujegunonoromizasemevudo.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dd6c20c2842ad7cd39247ff1fd4b996c/jixarir.pdf
    • http://cn-junsheng.com/upload/file///2021619141226977.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/xekokupubadelopomu.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2dd10afe5---2914922907.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rb1vfmo4n5r9ru622begstrija/3997893593.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c18e9c989eb---58260268624.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/8760408824.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b19ceacdf---nofamusobigenaferi.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa221653df---porevofepu.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/xefawapubofevivugalo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99c.bin
133c9d80bb627df07422296bb7e78191b189022477e492095d1c2ee387dc6218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 10548 bytes
font_01_sfnt_off0000f183.bin
496e481d75bc0b33f3c1fec8cad61a171253cb92b3274a0f360569313bd3a231		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 15916 bytes
font_02_sfnt_off00011a7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 16792 bytes

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