Malicious PDF — malware analysis report

Static analysis result for SHA-256 404df991c9273936…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 14:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e690d35d49f830f12ac00f15de00915 SHA-1: 7013c270c984a2dda37d9731a779580df54d8263 SHA-256: 404df991c92739361bb21d2ef3a9b38adbf14141f191cbe8e43d2970d3c80ecd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26cd688f9---jerovini.pdf In PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3f93524a---gadizibinux.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820493b3611---90045931737.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/gewopaberilawenoxefibop.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/sojeworivudorelogot.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/24482172068.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/75431063535.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/tekorivalifopojuwi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/p96p3fmj3d5cabil4p4bpd83cu/62540943441.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/66496860250.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f136712e35---bomukemuseweroxejupemu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608045562abda---80563057919.pdfIn PDF document text
    • https://krossi.ru/images/content/files/popiwu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18eb092e64---59018831454.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/tarekokoxofamefejaxe.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/1493573561.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wutepesezuzojuredowu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe540cc5ff---fotijugopeluril.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e00501154a1---11250080490.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/domafe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160e6631d0c81b---87984949855.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0529c43b89ade12ee4624bec8cb60a64/50600439578.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/20771165294.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/26304812795.pdfIn PDF document text
    • https://promise-land.com/upload/file/10205489736.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/4343815587.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xokojafire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=patent+act+2002+pdfPDF 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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 17388 bytes
SHA-256: 99b91fafb25b09d4dc0d0dd917f9de2fc09e756ba28b482ed90facb415f060ba
font_01_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 10328 bytes
SHA-256: fafb3a249b27685a794c6e32ef9cd942272431bbf5e152bc25bbdd5d5b78b39e
font_02_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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