Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b33e8c01ec282a…

MALICIOUS

PDF

92.1 KB Created: 2021-07-07 01:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8b1852ce2530f25b9c4871109df0b956 SHA-1: f812d014aa26187fea084d2b9c5bdfadd15bfd14 SHA-256: 82b33e8c01ec282a16491304774259fdfd11f05a41e77fa2fe5fd66eac1366ec
156 Risk Score

Malware Insights

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

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 compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a406c562489---sixabezaz.pdf In PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/20375989373.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/051207419931.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/mofugavowejoludep.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/19607467581.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/dd2hvh6ih3hbr2acl8ta9cv9ir/jafuvolasigumomixesal.pdfIn PDF document text
    • http://nova-auto.com/upload/gujob.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/kiwujagajitawafekaxene.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/18338171360.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/59528486634.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a727269a53---87533933617.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/47792030136.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/53572478263.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69d2017af---28996276501.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f209cabd---vofukibujasop.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/bbb5915e668added4973ed7e55b2892e/jisugamosudasoxonudivap.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/falida.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e3bb62b07---misalavovitarerabalo.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/93ce1245258803290ec939a2b48df293/jeseg.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4f3d9f07268b89815bae16d91647ce78/pifipimuberipidi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/dotbn37mu6ae1snrg9m3p4sg75/11270681739.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/66705523a7ee37dd9542cf82b8874039/6799995317.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160816fe8e98ff---41011279902.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087cff763c74---19055334842.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/74994717992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=girl+with+a+pearl+earring+book+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_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10964 bytes
SHA-256: 3bc78d157b72ce9e49102220ea83f32cc85e62ea0941e855061f71a1a10a9b6d
font_01_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16604 bytes
SHA-256: 1ddbbadc2f40347abba239d4ab3aa6cf8a47f4cbe2a6159c752a62729b38951d
font_02_sfnt_off00014acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1