Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f8133555fc3b9c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-26 11:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 357aca2459a1d4f21a190cdda72485a3 SHA-1: 94499766bc093b64efbf40d664f2cb07304f0214 SHA-256: b8f8133555fc3b9c63f44f3854e49a41e8633dc980c4d9f088bbd73f8ba2f619
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload storage. The primary goal appears to be directing users to external sites through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://mashtalkandil.com/userfiles/file/tukuliwudowufiwew.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387b1e1b73d---fagosexosorozejunedefu.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/83272806630.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0b0abc8c---vuzebigamidowalifa.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/mopanelujiwibapuxo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e93c922800b5ebef6798f4135331ae46/lugenirerinojewulirirefe.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/2723146244.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/zamapokujusowip.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gomal.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/manobemegimuwetilavigoz.pdfIn PDF document text
    • http://belv.ru/userfiles/file/tigitikoduwami.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109180612442074.pdfIn PDF document text
    • https://breedlife.com/upload/files/xumufiwen.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/964e79c4dc3c09392a4377758af5c78e/pikufazifelezes.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/xomozisugomirajo.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/89845420713.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/gejemexukavosizizeviruda.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/42117092464.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/ravidutivud.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/61341876876.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/sakuburirurawonejosoluba.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/zujam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=como+baixar+fotos+do+celular+samsung+galaxy+para+o+pcPDF 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_off0000bace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACE 11452 bytes
SHA-256: 414aba9b2816ebc46e8c93e9be0ed76754f99d8e6e7da7c7ee53cc95275cde17
font_01_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 17708 bytes
SHA-256: be29dcac8cf57c2909b99b8ab2b82b13fe633b63d1721993e409aa12e3caff26
font_02_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1