Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c003b8c707cc2f2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 07:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88b9241b9333b65b1f9ac5037734d2f6 SHA-1: e0e189d9c82bea177ceeca3b5599d4ee8a5ff9b7 SHA-256: 7c003b8c707cc2f2b836848ffbee50624f20aa203053bc99cdb2a3de58a349cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs and link farms pointing to external domains, indicating a primary function of redirecting users. The PDF structure and heuristic firings suggest it is designed to exploit users by directing them to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=galaxy+gear+s3+price+in+pakistan PDF link annotation
    • http://studioaba.net/userfiles/files/17233583794.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/350318675.pdfIn PDF document text
    • http://gr-chem.com/upload/files/61950366241.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/91024089865.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/46896552495.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/51475206166.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/dozoladalanib.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/jureguropawi.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/wevadaxepilixu.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/13092142614.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/newugod.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/89120490866.pdfIn PDF document text
    • http://gojjang.com/uploads/files/41429812094.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a357303a3---jesiges.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614121671d558---puvuvusegidezowuxujo.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/92310750417.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70b25b4a4---sofofofapopinobirasigopi.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090516040217.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/71191318194.pdfIn PDF document text
    • http://babamoleskine.com/files/file/daburaguj.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/43904146188.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/73305171343.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/gatidudape.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/tanubijuwabewepitezoboz.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/25141905890.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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 10948 bytes
SHA-256: 54ed3c2914a6e239fde82af4b798fd7a51ce2ecbff0cfd015836aff14eae86cc
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 17624 bytes
SHA-256: 75a0d3f57f0fb678be501d3b074a87564626817836364b22d5557041b3598c63