Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a91dd5ea2a5eb2b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 08:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bce77dd0d00cb8ec3d3bd112349bac6 SHA-1: 7b7e9fd1e260d2dc4253d5d4c55efc9ec1b49aa3 SHA-256: 8a91dd5ea2a5eb2b2930e5e990516ae9a3d940eac3d101bb6a74baccbca007cc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, functioning as a link farm. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kstarsmall.net/userfiles/file///fazawokozikipanix.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa94767515e---45900141707.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/t8u956e64aa4sere88fe7gptvl/xofedabufimagutuwegowera.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6093f7ab---kobodijavilozafegudevidak.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/8145964070.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/nibubipareminobipeloga.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/pajelazijum.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/20144531837.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4621a074---riviwuvonojavitet.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gesiporolone.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/72260138578.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2752b3f85---5888701972.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/37351268304.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89192eded1---torofeme.pdfIn PDF document text
    • http://tootooair.com/FileData/ckfinder/files/20210618_D777E3A1B5766698.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/14880035274.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e453e3182b12a4753429b63e57a64409/82493449653.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612afcce681be---89701090748.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/milabodugefa.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6855d04d5---67176294755.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/jolalarisenaxaputadupagus.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f297d0808---45024746530.pdfIn PDF document text
    • http://jarosi.hu/files/file/46668949202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=coral+snake+red+on+yellowPDF link annotation
    • 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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 10376 bytes
SHA-256: 661e0d172e799ca50218677f8c2121b3ba25a26111107d3695084b373ee15bc0
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 17624 bytes
SHA-256: 322f99bdd01793a26fdb412e44e8f29be70aaaca916f910b49e9ae2b02082111
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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