Malicious PDF — malware analysis report

Static analysis result for SHA-256 15460795e3b935b9…

MALICIOUS

PDF

101.1 KB Created: 2021-07-02 20:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8898179211d5b06a6006f0c52257d671 SHA-1: 9b9ef166196412cf18e22c76ff17651dac23b375 SHA-256: 15460795e3b935b930142a0eb964427209b7025b6da15e1bed82ccc6f0e5563e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e9da5cbc90cb238a4762e26960ae431/65900413626.pdf In PDF document text
    • https://aplusadvance.com/naver_editor/data/file/72655358237.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3cc6ecdba925d4a2881e3bc5e3c68f8a/tusiken.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/rerupalinuw.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b998307fb---37659465890.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3a57c0c3b5f9ca9c71490fb35f070ba5/19436479898.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zuwasesonesogazubaranop.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/zobupugevos.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/oi5a7gbgf4cku7kq5vu0kob7c1/fumufizakebitegeraludibu.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/opt0i2gsb4ua781mhs1ih9foh9/dexotaremelalisifexuzi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d5c6fd96---32394036035.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dejjls2bi6vfp4b6cqg9egc6m6/7037446631.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081886f6ecf6---dubuja.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa8f0762f---50075848158.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062600045273499.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4a49cc3f9073e55e907e2c7f3d44d591/96176121158.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/32957417654.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bibipowusumikeko.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4593faf502---soxeworekezika.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/77572844397.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a1c7102507061d7829d41f717ec2dd54/pexopikixefaxemusutifad.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fe957229---75853999915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hope+so+in+tagalogPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c4f2384063518972d277edf95d15c78c/86029731053.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_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 10316 bytes
SHA-256: a4ce4f3d485a6d7f668ee6b96db5be3a4faf2ed562e80cf619c4eb9a4ff68d8a
font_01_sfnt_off000132e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E0 18780 bytes
SHA-256: 8f8ec64b1778cfcda0f47ec1cbc3389b9a6230bc33c55166d358a8e756a14eb5
font_02_sfnt_off00016334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B41 2716 bytes
SHA-256: 501ddf04ba429aece7315a422bf8323fc457e2f8e88f1c4170528d99f28d650b