Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff897d11b9f8901…

MALICIOUS

PDF

110.5 KB Created: 2021-07-05 20:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2c57ec05f6352bf821df461a3b834684 SHA-1: 990085fff9ddd6c301a07069cfdb73c225160090 SHA-256: eff897d11b9f89014fbf8ba657cc580227e101c751da03acc44d73ccd3596f41
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://artside.org/data/temp/file/99100085043.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7e7205a87af42e39cb02bcaecfaadfac/20273790534.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884092c77e0---55451497817.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/sinadaxaxuxoga.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c849c8fe29---18500615590.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f23a2d7b7---poxemokagazuvikoto.pdfIn PDF document text
    • http://abpaluso.com/upload/file/74464578550.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c09c8d657c3---60852526493.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c98e75a7---riwiguxenuva.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9vv03719vdsnk44gshuafepamj/1113006495.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2518b088f4---5794124376.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/xuguvumamapotuxosu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/rf1vd1l6hkde4q3sonb7ki5hos/joral.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a4afa88c2573864864e00f3b4cb6e17a/2817808290.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2io49akov9r8v097db7e2paup3/vikegipazopebogan.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e2225ec3fafb6e6f57e8a61412d97157/88870392669.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098bec309aba---baxiteveduwujukadarif.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16075572d7500c---91541614026.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/vunarola.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b83d6a46---91149155551.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/bidigujeserusodosufe.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/19565107030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=split+up+phrasal+verb+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f2ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF2AD 25212 bytes
SHA-256: ea2019d40f5c162a0401b25989f1818f6506f1a54cdb7a0d25de690f211084e7
font_01_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 13928 bytes
SHA-256: f6a8c2a1245450eb9f990fcda837245789d3b800b29625613b3c7b95c40d7040
font_02_sfnt_off00014a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16274 18680 bytes
SHA-256: c6bde0fe40c4413caa1842c22e46aef8c40f346104a17e295d85da582adc5300
font_04_sfnt_off00019298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19298 10960 bytes
SHA-256: a0e06aa365403a160195a226b7054bf8b3e1fe5b11538c0747d1a4c59ea84542

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