Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eed33135ca14fa…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 00:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62deb1cc3b611c394af85a2a726ebd0c SHA-1: ef562189937fc2e71c225962fcbc4f69f9659609 SHA-256: a8eed33135ca14fa9c74de0857ca4c3bfdeb08b48edc1f3c65878ceaf6847beb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external sites, some hosted on compromised WordPress installations. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, consistent with tech-support scams or callback phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/131c89944e5154d4d0c31c4b7043d6b6/nugogobi.pdf In PDF document text
    • http://inercial.es/uploads/files/rutiduvivavamijadi.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/28250135965.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/mepodinevipo.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/tasebobemewobifakujo.pdfIn PDF document text
    • https://thehouseproduction.net/file/gufemajogaf.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/43617829975.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2a61ecf83d14883cb04c023c2d390ec4/komenuxigazak.pdfIn PDF document text
    • http://erpos.sk/data/files/ruxenuneruso.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/70381260421.pdfIn PDF document text
    • http://deshpanday.com/ckfinder/userfiles/files/nizujekexop.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/36949287331.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/gurago.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/3853767189.pdfIn PDF document text
    • https://norservis.info/files/files/wasalabibupofujedik.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/lazudelimelido.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bepowibisiximepuzowutifaj.pdfIn PDF document text
    • https://12shio2.com/contents/files/toduvezanopamekisaw.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/nekazavifatujulor.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/pikamulilatusa.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mhd37t1f6vhb401i4rnpmoj1e2/75417992631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+paid+apps+free+download+sitesPDF 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_off0000b822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 10560 bytes
SHA-256: b836ddd48be8e302fa19c532c7c33e379890e899b874cde2da0a5752f55fe2f4
font_01_sfnt_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 16472 bytes
SHA-256: eba6f78982ad2f29044a54a66e5566dd3651ba3251e2741d20871c730e839c17

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