Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbd92b9e7823715…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 05:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30865a4fbaa07b32355d20c30ade4dbc SHA-1: 10a36b856f2bb7a3ff07b318c63057bd3ccd956f SHA-256: 8dbd92b9e7823715ce445e502ad1443f6687810ba6d8bf77069bbffb8e7dd785
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites and link farms. Heuristics indicate a 'Payment redirection / bank-detail change lure' and a 'Callback phishing phone lure', suggesting the document is designed to trick users into altering payment details or contacting fraudulent support. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://wastran.ru/uplcv?utm_term=ethanol+empirical+formula PDF link annotation
    • http://cdjuchuan.com/upload/files/89077624708.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/beligelade.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/49337018003.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/50445240595.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/waforugutel.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/83060715375.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/364ce5e2da85480d14bfb87dbb5898a3/29945687104.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/79049941268.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/lurobukazupod.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/kidomaxasuvijujanom.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jibimilejevipizabojuzojod.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/mogucfnc5g3pmjqg73dp505d00/83821858201.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/fovugadinagitufeganixigol.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613956f3f1089---78351050357.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161476c1351ca7---83028669292.pdfIn PDF document text
    • http://tyextractor.com/d/files/6895819822.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/65646475025.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/pekol.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/xuzipamisoje.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/tulegeraluludisaromiba.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/babulexubataxo.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///xivopumo.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/duferupapakasamoxuvud.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b880098997---jibutuxo.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/xotodo.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_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 10660 bytes
SHA-256: 5ad33fb93ea7bef9cee9c42ecda2660e18cbb9cee20b199093257658458acf11
font_01_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 20860 bytes
SHA-256: 559ff4e0674e93bbb0d428c1be7398468cfea008fb1090b0f55d37958d547eba
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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