Malicious PDF — malware analysis report

Static analysis result for SHA-256 9116b739b24ff575…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 09:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cd144073836903bb17afa018218ca07 SHA-1: 793f23f4241f7b1dacd4f7715d85654ec404174b SHA-256: 9116b739b24ff575e1ec70ffd136041ab644cb6fad93fa504fef72cc680fca99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to download files from compromised websites, likely to deliver a secondary payload. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading malware disguised as legitimate software or documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xn--m1age8bh.xn--p1ai/files/file/fazopemaso.pdf In PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210725_0917D53D79CBB674.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/siwenalejegetisigup.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/3mv0lh2ac4lasfqt64l431dej7/retuxogotokupupafelodo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/f70j9rk6vn2qq99g2mrke51sbj/96950622318.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4ee039fa---gavoxa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077691736a15---gowenerovukoza.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/zizifigasanutekigalikeboz.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/dixeselinibobajumafe.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eadaf0a6cd---98931390245.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/64567529706.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/af65bc62c14560fd34e9794f858adc0c/tomojiw.pdfIn PDF document text
    • https://premium-house.uz/images/file/52087508258.pdfIn PDF document text
    • http://fygl.net/uploads/file/200428515625.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/giwemofegipejeduwuxugeva.pdfIn PDF document text
    • http://paradoxine.com/upload/files/rikedevulujurimita.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0c69849ff---devovutulisirokulipezix.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbbb468f6---lozegudigakuf.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/21961256861.pdfIn PDF document text
    • https://noventa.cz/media/files/file/61743989176.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32de34b9ce---vibupojuderedejefatowiba.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/54518645562.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/97472654626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=installer+converter+pdf+to+word+free+downloadPDF 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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 17844 bytes
SHA-256: 6809584dcbcd5ff9f164ee952aed7d6d175544b84f8b047cbe15dc93b7fda1ef
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 10624 bytes
SHA-256: a3fca4838b30efa05971b496f6beb8211419dbf716e854a821d45e6755381e5b
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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