Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb7e1a70a946b73…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 13:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73949eb7667476416e39654f2ebffbb2 SHA-1: 60ea32582a5a4dea1f31e5efd50d3f92f94d7a83 SHA-256: feb7e1a70a946b73472804a53b2cae259ccf80775555ca2a46bc4e48b2816c07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the PDF's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=aa+car+maintenance+manual+pdf PDF link annotation
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/eeb6fa69e7828b9939f8530da313eb92/zakakorafowegopidigodax.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/deviwajenemerevofivuronid.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mhjgmas38hidagsakd1n9gjuf7/feperuzujojodixorafesep.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b7275fb6849c37c85a42983d47067461/72493015509.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/pekebuperitunexalifufum.pdfIn PDF document text
    • http://status.cz/UserFiles/File/74799751777.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c449f8d6a89---gupijenutinaxe.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/48090957959.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a51a05ed---funipukogajagute.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/55782332834.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a783dbe6---jopafudiveb.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/xuvixowilas.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/pibokugifimidipexoge.pdfIn PDF document text
    • http://muszempilla.com/files/file/lurelorositebilogafali.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/rotimunusofijug.pdfIn PDF document text
    • https://edarky.net/data/file/88651361061.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4jusqifohdr5g22t3f5ksnsku0/vulinolujefisowuvulijo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607b280546445---51859123796.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/sagaxubuw.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/83116856976.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/880597ce6e8a3ac0694e3aa375a1171d/13169649109.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/ruzegukelopilurudonav.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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 17040 bytes
SHA-256: 3de27b5d17aaed7d4d9af9a2ccd7fb2e42a36dbf59f4c4a8fc8bfe5d7e4d541e
font_02_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 10576 bytes
SHA-256: 0a45203559713ea258ce0740639ff64c81f6e61aaf40cb67b014823bfa8459df

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