Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c434cec12b32c5…

MALICIOUS

PDF

99.3 KB Created: 2021-08-07 21:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7e2529b1064c9ec54b81c907f6d9cb1 SHA-1: b1a557940d2a5a87cf5d9d4e5c0c84ba1ab175ed SHA-256: 89c434cec12b32c5b354781adb51f5c25ff4eb89a8ee8e5cafbb0e4262faca54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate an attempt to trick users into visiting potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://allytemp.ru/uplcv?utm_term=graco+pack+n+play+travel+dome+assembly+instructions PDF link annotation
    • https://excore.hu/ckfinder/userfiles/files/razekosetufesitojatizu.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/vepufodoviwisepir.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8017ceb7dd---nibutizevoliso.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/nezomolilagumu.pdfIn PDF document text
    • http://springbook.no/files/27391964630.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210526125117_1270679003.pdfIn PDF document text
    • http://planbmedia.hu/files/68848815203.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/15068544460.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/68680227723.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/48702899788.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7e2ec013---32023520385.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/nurufutemafagu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f0ceef06e---farepobupizalubexorigezo.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/xupavanilogixesiropotomof.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/89305598948.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/601517e779010cceaef57d16053716eb/pisuseworazugu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac76751d42d---fuxojuwiromaz.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e86af919---99171932741.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815f2f26da0---81021395956.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/76e7dcaccc6d7498f113b7f0d127ec90/68306997805.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/35738007748.pdfIn PDF document text
    • http://email-database.info/userfiles/file/97187732833.pdfIn PDF document text
    • http://93564497.com/userfiles/xetexu.pdfIn PDF document text
    • http://www.emailposte.com/pictures/sidanemiwezozuvugujovi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 22004 bytes
SHA-256: b06e5e30aa8167ac37ddec884ce64c23e21fb1e4104a11f14467752583863730
font_01_sfnt_off00013799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 16064 bytes
SHA-256: 72adb75ce0134c008902b72bd72828563651e1928ebdea02307046daa125e27e
font_02_sfnt_off00014cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB1 11224 bytes
SHA-256: d892f5ebf91ab48f99dc8678fcb6d23510093d1cda606523a7440561cd530f90
font_03_sfnt_off000166d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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