Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfc77dea770e225…

MALICIOUS

PDF

98.7 KB Created: 2021-08-31 01:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ac6562a1cfec98412e007027e9137c1 SHA-1: 80595c5380cd49378ce68441403405d6b4d2a502 SHA-256: 7bfc77dea770e22522140fb64d4c40a5fd8a24814c8e6a676825dd5f2d15ea41
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 malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially disposable hosting, designed to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://livingkaneohe.com/userimages/34061027443.pdf In PDF document text
    • http://lawfirm.vn/MINH/user_files/file/nikogapisekasuronojokab.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/15775609200.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a797c121a79---5514790082.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/sesumekofu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7586493fcbc501e73742b898ff5d4569/jopifebosinazuvamek.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/58048545895.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608394ea6c1a1---29069978767.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/fugapobulusenixamepitavir.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e005cb0fa2b---52475946211.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/30842546022.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/45225249664.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/nagofebijiwuboriraxom.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a4d200f7---zawoxugibadipidonexevef.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/47afff1ed7ee015f4147277e2b5386a2/kafadaguxafesekisuduzu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/j4158loe4df2liu4nhbts5l2av/liwotisorodililos.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/zizuw.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/lawaneduvokowipogavetilij.pdfIn PDF document text
    • http://tochuchoinghi.org/files/jogupi.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/bamagepo.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/vixini.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5193b0f9cd0d033eab3d4296c9731af9/vepaxogatixedo.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/texoxodizova.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/io7gl8n8hkfkr9e982mp6h8na3/nerevadili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bassoon+solo+rite+of+springPDF 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_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 10584 bytes
SHA-256: ed51f1e661524bc5e629ca13f3618856aa06d06cd981ca1d2b278a42345cb0c9
font_01_sfnt_off0001346e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346E 18160 bytes
SHA-256: 073f838e62005e4c07e593f5d5b07b14a3d9f66008e7bfce8c688cfa44621fce
font_02_sfnt_off000163e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1