Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f223d4758230fbd…

MALICIOUS

PDF

83.9 KB Created: 2021-07-20 22:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33c4dfec1b1308b60bc83cc1cb2c9ddb SHA-1: 9b3c818b18da2ac7cb473e030634514f53f9ef94 SHA-256: 8f223d4758230fbda0c1fdf6e8ee90ffdfb38f8381a389a440b414af2609741c
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wijadofutila.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d928d0255769bb99d6fb3e635429db2d/1816404749.pdf
    • http://kaies.net/upfiles/210714140926449867j6j21n.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a00c7c050d0b6f59bc2449b9e4af1feb/jopubizivatu.pdf
    • https://xanbiente.de/userfiles/file/fuvux.pdf
    • http://amuseonline.com/absite/userfiles/file/17802143223.pdf
    • http://oicenglish.com/imagexx/files/13039583126.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77f3a099d---68726709678.pdf
    • https://medpressa.ru/files/file/xopemipujebevowixozuvada.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/93724455164.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/46842492165.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/57f933a1d9ad0198c39c68dccaf747af/81842383377.pdf
    • http://analogsys.com/uploaded/file/13091168760f183fd3a9aa.pdf
    • http://www.look4job.gr/images/_user_na/file/63381179931.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ebc86ec5---xapifozasesuwilumosifom.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/kulogiwukujavesitogujak.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e982ed26133---xezuninubigaxupo.pdf
    • http://mega.kz/media/upload/files/96802878252.pdf
    • http://alburigiott.it/userfiles/files/26592373812.pdf
    • https://clearpatth.com/userfiles/file/26298529016.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4284678a5047a9287c7562415c40cdcf/15224273598.pdf
    • http://asja-doll.ru/userfiles/file/wobuwobirok.pdf
    • https://taevlingar.se/images/pages/file/radujuw.pdf
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/93094491226.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=replacement+id+nj
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e659.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 16792 bytes
font_01_sfnt_off0000fe6b.bin
db554994f9ea6fe413c74dbd87e09c73a4adb5e5da6d954989f6fce22c19dc34
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 17072 bytes
font_02_sfnt_off00012b44.bin
d520ad5e5b98dbfbb5d1d2e80d0c4d741d0d8fa2783222b4d3de52497c8aeab7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 10464 bytes