Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec5ea47c09b2039…

MALICIOUS

PDF

85.2 KB Created: 2021-08-07 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e683dfa2d13a16ad3f88b8247f33e80a SHA-1: db56292064280f2ba845c201f46ff191d4505975 SHA-256: 8ec5ea47c09b20395a0a57e6251cf74b16c7662ceed4f63d57b96dc2bff3c44f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, consistent with tech-support scams or callback phishing. Numerous embedded URLs point to compromised CMS uploads and disposable hosting, likely serving as part of a link farm to distribute further malicious content or host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • 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.
  • 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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/etkfeed358s9tlcname3jhrt42/karas.pdf In PDF document text
    • http://nietegeleuve.nl/cms/files/tudivolakerimipefawedogu.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/zuwosuguw.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/kidadobisewemi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b22dc2c5---nubesagorakizizurugumizi.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/82406790446.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/farev.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2b153875a5553ab1c8e997cb0b96f191/226590436.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/jipibapi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070720103242.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/nisozukur.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ggkqac7ud78vfhg8je4nufngj6/bajufuparajopedafanipule.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/17954480519.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/37114762808.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4c925ebc8eb881c46c447c4e933bd2a8/gedazimolux.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097496fedf9a---gifikegusujuxesotawedo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8b94049a---javubesesulowulolodekiwu.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/leraverevexozog.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/xusolexumepoxaxe.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d2f2966be6c7497800c12073c2a0a1f/movagakazo.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/fesowexojogojidodinato.pdfIn PDF document text
    • https://airshow-bg.com/file/39677795722.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947ba6571ef---76338412836.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/370313958.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/rolete.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ca38e27c62144aa2a2624d12a2b39b8d/mifazemefejerevejo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e24429746c404365f14579d004e0aaa3/xojibagad.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7f4acm7q28hagch4jrtsd3efv5/dofosaburawelutabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=smith+and+wesson+32+long+revolver+serial+number+lookupPDF 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_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 17904 bytes
SHA-256: bb0d9f00961149a35c02331242b4c06d60425c243863469050d42a1028449a79
font_02_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 11692 bytes
SHA-256: 8e76394d306738e748f8c17ad551a283f98765eb76f8ce58e0cba5cc7b169748

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