Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e54cb306fcd0e00…

MALICIOUS

PDF

90.3 KB Created: 2021-07-14 09:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0842c206beb73ac4a4ab0acb85b26232 SHA-1: 783aad989be0bf4b5df877b93c0b2e42ab2faf28 SHA-256: 8e54cb306fcd0e0066e7925baf28571679985aecb13600e6ba7e13117291a623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on potentially compromised CMS upload directories reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c975edd506---6782625520.pdf In PDF document text
    • http://capesociety.ca/uploads/files/84482342831.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/74552849879.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bdc2aff8d5d207466032c834132afc36/pumugelujalo.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/28651337378.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f08ed3bd6---piradubepoxev.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4g0j1euhbs9fvlerm6tlpstc68/47950342128.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c305ddaebf8---22934988389.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/zuduzeseme.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a328994462---16320136482.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/96004701334.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/285cc74eb9a4d026b7f98934a1b9e5c7/95728742113.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc641808a---kusimefisigu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a1abe11ad34---97814356713.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/mokopamudivoxuv.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607453d5d4bc4---80852688882.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/41649753292.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/febeva.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/jgggqgrnuu6dcj8bcaqtckfl8r/resugasutikitapere.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/55e2ed33fb7c13fd5b244fc5c9ae8d83/81450215984.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad438fb8f---58718051483.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/27523319289.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e676a508a94c5c3711bc161d72a95dd2/26342858810.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215201547597296.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/bakejavewifonubiterod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=convert+image+to+excel+table+free+onlinePDF 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_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 16368 bytes
SHA-256: 29a93d6c599a34fb9214f45e2334239926cf4239a29837c40def06133e651881
font_01_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 10852 bytes
SHA-256: 5b06838aa7b8ed45a93ea79285586c8f6cae40ef23fb0e5d0bee28a67d05058a
font_02_sfnt_off000141ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1