Malicious PDF — malware analysis report

Static analysis result for SHA-256 101955ff8c6a2ccc…

MALICIOUS

PDF

93.4 KB Created: 2021-08-01 02:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4c779705704f894b762e89dc213aa99 SHA-1: fffb871404bbbb6606bf3fbd645b15e7d3cab79d SHA-256: 101955ff8c6a2ccc41a8ba0c3d7b609312a0c40ca84a640fb3811632892c90a3
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm indicates an attempt to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cdmvt.cz/sites/default/files/zevebogijopone.pdf In PDF document text
    • http://getvisa.ru/images/File/gipevefivuzanono.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-9/20210709123317266418.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160871a35bf30d---bejutokopedolu.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/wizut.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/63bc301cf1d7e3a323891d6f222d3106/pimasemumevekel.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc7c8d25c---28532282992.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jibekerotijib.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607939bde86fb---1028877641.pdfIn PDF document text
    • http://fullx.net/files/71192758287.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/wijedixujef.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956c846f96f---93845195066.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dgolpkenpi3dllr3c16mha67u8/55526456292.pdfIn PDF document text
    • https://ebooksweb.net/files/file/dulatuvodogonirinipo.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210519042237.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/52416559889.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lobobu.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/30968664905.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/7043730942.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4bb56f203---76578834868.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071541414e04---dizuzumazulisunaneje.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/vonaguwow.pdfIn PDF document text
    • http://splogservice.ru/content/file/67368332366.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/62594429186.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/764f6fd2b5b3bd2e2f7fa6de658d4340/69381665143.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/nasexazorugekepekigekere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+trial+of+spongebob+squarepants+defense+answersPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/65417661338.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_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 11212 bytes
SHA-256: 70ae0ee9188553f49e48a3e4b46e70b098abf51cd178c6ecdbcaac6c5861de45
font_01_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 16724 bytes
SHA-256: 6f80880ff78e1017533a65a68fee4cfcd9d9b8a10a924246b4a010a5dc696c58
font_02_sfnt_off00014c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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