Malicious PDF — malware analysis report

Static analysis result for SHA-256 93863657ed162805…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 20:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ef7edab2845bfb594b69d0a271320c7b SHA-1: ffcfefe3f765683c1919d07fcb45868620407123 SHA-256: 93863657ed162805f7c2392482439fd8e931e98d6843ccd76002ff6e18f0295e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. The document contains language suggesting an invoice or payment issue, combined with numerous embedded URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the phishing lure strongly indicate an attempt to redirect the user to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://laborke.ru/uplcv?utm_term=recharge+pay+bills+%26+shop+apk PDF link annotation
    • http://skncn.com/u/files/rijopaxuk.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/50402734853.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pimajiz.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/57286641409.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/jopafuveresomoxasi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f1ba99c1---bifizenine.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/dagimiz.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/kasipezefib.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210907154955_ftssyz.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/48592656878.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/97449520227.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/54646104465.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/27327490431.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/21990820839.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/53147094666.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f7f9e49432bdfdf5554b97b26bed44f8/semub.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/zavadegefaxepuwogeziv.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/29440684353.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/gafesidajo.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210903033437.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/linukabosonebopowixugeruz.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/89768605132.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8f902f035a10e214385d032c998f38a8/55702770644.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/64282472267.pdfIn PDF document text
    • https://anaksemut.com/contents/files/lejenigat.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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 10628 bytes
SHA-256: 0d508ae43d764e393a69d68077cd06462ab4e50d56ade9a7ac11a728d324505c
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 18568 bytes
SHA-256: 7da7c254f4ed79143480225e291637144ee222fa1f7bf0b00f346a872da255d3

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