Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a5e20663da552f…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 20:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 177c16f4672201c81340cc7ae3e7ffa6 SHA-1: 5ffcf77f186cd704254e0379f0cec7960a777da2 SHA-256: 13a5e20663da552ff6599e191f0bbd91c547c4602b04f68e047a7c0d0cd8762f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://wastran.ru/uplcv?utm_term=rymes+with+music PDF link annotation
    • http://livestocktool.com/d/files/26912655745.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/42677656510.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sifunipukiwavozojobena.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/270c282e9ff82b02645b9b9e19de1a4e/86389279134.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f0033efc74288e0541370a6995342ed6/mefukapuzozupedo.pdfIn PDF document text
    • http://hidramaco.com/files/files/47138782118.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/63653940274.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/kuxabenuzaxorozikovuna.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/batusewabapo.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/buximuf.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/74908991190.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/27013206707.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/99022142900.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9371d213d---13209710911.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/39577883513.pdfIn PDF document text
    • http://jiab.net/userData/board/file/lotajemamerota.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137757e36aaa---14863919730.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/bejalegajijuritatogewezug.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/240806385741.pdfIn PDF document text
    • http://tano-cable.com/d/files/85991854024.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/govafoputiw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f89e9d4e41---japolidulilevarekupoga.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/18776467269.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/dutokureb.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/8443052323.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/gosavod.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_off0000b56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56D 10308 bytes
SHA-256: d1bbe9e3dabdf62ea17219c9118a65ef08c220e0e8c16b1762a981e4b4b808bd
font_01_sfnt_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 15948 bytes
SHA-256: 6ec2198a07b59d89fdb0ca52350ad95265a306c2549a2aa2ed8e45e43bae8e28
font_02_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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