Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3a33888a62d720…

MALICIOUS

PDF

85.5 KB Created: 2021-08-12 12:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f1d26ddf775057ef4b27678557d25c8 SHA-1: c88c954a44dfc5cad6404499076de04829cb81c1 SHA-256: 1b3a33888a62d720bf439762655de9bf65db9ad8a3c426efe9b1436257bafa24
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aczelzalog.hu/tmp/kegejuzivabiv.pdf In PDF document text
    • http://abwingstop.com/uploads/files/28995482727.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6f854c9a6351f20ed150e1a071ec4f2c/vubejanomejebadabep.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/fegonerabipip.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c881ad15ff---12631812583.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/rixovumupozirewimagetiwam.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/xukemidizisanaralovi.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/vipemiwi.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107081328199840.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/1297930547.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8405a70c2---87828645954.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/19641064205.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/povaxobuzeremaramusasul.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/tenukowekewasitu.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60fa165140861.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160766bb8b8a3b---71495098847.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/04518edeeaddb51b942817a8ee336aec/tagiwovoxivavidibukafofub.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a3de76bff5d8e2d0ec6ded309809a464/11951036618.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1623772737785568510.pdfIn PDF document text
    • http://katachizu.com/img/news/files/mepafufagadimoxadesemub.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48883f9f3---xinasiximomudurujovi.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/45819670308.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/26923949759.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae398c0fa---purejuzugajix.pdfIn PDF document text
    • https://activepymes.com/pub/file/73348666762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+give+good+full+body+massagePDF 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_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 16456 bytes
SHA-256: dfa6a939858455b20a656aee3c433ddbc8e15f890abfca876c602a945901c3c9
font_01_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 10988 bytes
SHA-256: 1aa6c92e0c46c9c36e037e54e13ab7c54779ddb67d3d4ec5ed801b1090c4f697
font_02_sfnt_off0001307d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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