Malicious PDF — malware analysis report

Static analysis result for SHA-256 12359906313af0c3…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 20:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15398255259c9ac7c9b55a50c37d379e SHA-1: 2bcc625ce814b43661b52bcf4effdc231c471de5 SHA-256: 12359906313af0c31ee4d5b984e345b29091a5fe29c46db58afdff8f2fb72651
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://acronimocostanzo.com/userfiles/file/nadafovinuwepapujiv.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735e5522f17---42684010701.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/93686077822.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/mufenevipawedusilexupika.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/86112828416.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/milupulakade.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160983c860280a---82251338284.pdfIn PDF document text
    • http://kbchina.de/upload/gepupejoxetatuberakemiri.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc2547ada---98408936876.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/77573212990.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070026778593---rofixanat.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/3976736608.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1460e19dd7abfa0e6efe90f614cb94d/tutepuzizetezuras.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0aaca6edebfe81eb1069f6fe32a28f72/zijoxiravijonetaxafobi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3d1d54snkm59bruihbf3be3vl1/89251732228.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/37513683287.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061601442680554.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/25240133206.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/20338361865.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/80355066588.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/40497255147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bus+ticket+booking+offersPDF 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_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 17400 bytes
SHA-256: 889a54448fc27fde0f3e6d5a20b989de91801e1638fbd8309ee6162b96ba96c7
font_01_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 10688 bytes
SHA-256: 53284edc87a4acb9eabcc792746acb1d0e68c2b519fb46469a93d8d314ca4581
font_02_sfnt_off000137f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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