Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f735c00c4e6ea5f…

MALICIOUS

PDF

66.9 KB Created: 2021-09-17 23:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 60e59feddc73304136ccbe2a6ae2e0e0 SHA-1: f76d252c4381e734decf79354deeb25ccef46b13 SHA-256: 1f735c00c4e6ea5f72d4a22139a358b777f81c1ad76a0bfb72bf271b42950ea5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous unknown reputation URLs reinforces the suspicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mobilenmr.com/files/files/62341496267.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa16177d37---tepebefevukubupizividajop.pdfIn PDF document text
    • http://atrsara.ir/resource/files/repijurunibur.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/kagota.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/lojuriwawol.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/boxewegideme.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/vuxuz.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/08d0db3ce5b29eb70b4557283c23162a/41900928068.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021921193711.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/gufaraz.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/43901548234.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/nalewogixo.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/69940432080.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/52181671100.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04e447064---81142740469.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/loxebomagenebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mafia+city+hack+iosPDF 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_off0000a68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA68B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000be9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9D 16484 bytes
SHA-256: 25e0624724cee71780619c8a573a4403055b51901fc41a13f5527d09ee823238
font_02_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 10248 bytes
SHA-256: e0c90b2b5850af34957816a571fe281bb8e0418206794a4424fa28c6006c8e73

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