Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac39c21905ad85e4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 07:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f8e97475c8f42a7d6ccc3bb0953560a3 SHA-1: f29ff51339b55180cd31744051262029ce305024 SHA-256: ac39c21905ad85e4ea398d1307ca540e8d7606145a72172665c8f979cae0c064
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains, some of which appear to be compromised WordPress uploads. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=wooldridge+econometrics+5th+edition+solutions+pdf PDF link annotation
    • http://halaljones.com/uploads/files/nolili.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/35604739607.pdfIn PDF document text
    • http://fitviewer.info/files/file/83773157435.pdfIn PDF document text
    • http://allycatering.com/userfiles/3348415291.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/36361467208.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/9998555818.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zirimifumomoxulaka.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/xowigivule.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/poc3e2dme8j6n20s4nk8neqb80/16036173922.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d812beeca---48310994859.pdfIn PDF document text
    • https://nomortiga.com/contents/files/nevifesuvimizo.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/nixurasokatiduri.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161447182e65a4---sezififawowedubofopub.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/87755078828.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210919015555.pdfIn PDF document text
    • http://uteambio.com/upload/files/88149927433.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/mazim.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/58425994104.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/vepos.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1ec7287f0---70994093183.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeb192df5---51504835879.pdfIn PDF document text
    • https://netpage.info/userfiles/file/gagojib.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/47457196990.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/merupivejuwesinemamo.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/xobiwuneminutopubofipelok.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_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 11132 bytes
SHA-256: e131d419bd07ac27735e3847f581c2edb88fba179abf42e57a12e14783a18a60
font_01_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 17944 bytes
SHA-256: 732339c80cb394a19d1368a5ef096a36643b9f61fa21c8dbcad83451948bbcc1

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