Malicious PDF — malware analysis report

Static analysis result for SHA-256 829cbd79958e4631…

MALICIOUS

PDF

93.0 KB Created: 2021-09-09 02:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bf5c55f10e998db0ee72bf34f0a69dd SHA-1: 5a81ce4390ce7653c40c61277acdcaed95316bbe SHA-256: 829cbd79958e46311b4774a97ee8059690db8cf72a263986f4e3dc62314fc844
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. The presence of these links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests the primary goal is to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=starflight+for+android PDF link annotation
    • http://lahma.pl/_u/userfiles/file/pexepopajopom.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/kexikur.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/8147440157.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/70543294196.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/pamaziraxewig.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/42287718672.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/bokugebasu.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/disizijometile.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/xikagobibotinid.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133806c14bae---tuxifuginapudukulotuvif.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/gebufafipusosulujemafaxun.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/89195097112.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/47390077765.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/73636266518.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/17406347977.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wabalolidizit.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613301a731127---91759778369.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/955545040.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jubuvosepixip.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/85018708396.pdfIn PDF document text
    • http://teifsepahan.com/files/file/39875948191.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0a3cd1d1f8ba35e0f5ee1dddc9134c98/60030110861.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/7113909854.pdfIn PDF document text
    • http://aquatherm-graz.at/files/59235539065.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 18488 bytes
SHA-256: 2d05abe0d4b06434bb31615da50506843f96261c7c75ea9949e8f1f928204726
font_01_sfnt_off0001369f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB6 10408 bytes
SHA-256: 63bb82786b9dbf507670f65d4ad362f4ca806899357d5eb81daa399e6ce61081