Malicious PDF — malware analysis report

Static analysis result for SHA-256 964f50e1586249b4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 03:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 846971dcf7cf79da3bc737968a3557b8 SHA-1: a9290be062554f04217f08854fd29b0972efc2d8 SHA-256: 964f50e1586249b412cb909a163b61ffbdbc9d69904b3eb8e362bc71c891cf9e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS and the nature of the URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=how+to+get+someone%27s+insta+password PDF link annotation
    • http://ibshop.gr/uploads/_uploads/files/81694406734.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2321d958b---85404521910.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jowepukinomopogefapujo.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/zazowarijeg.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/xagajekidadije.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/sanadawaveguzol.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613613b9a701d---petofese.pdfIn PDF document text
    • http://dentistturkey.com/image/files/82980755801.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/ligawogebeno.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb5781b190---5903915193.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wukarilojovojexu.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/mulevuraxevusogi.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/46790407305.pdfIn PDF document text
    • http://mcutech.net/files/70080643497.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/17387415172.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/zevurakanexobelitebupugig.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/nukez.pdfIn PDF document text
    • https://mbbs.hr/files/nowune.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/39635143423.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/76927325851.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/46372108192.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/55878607171.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/dovedisujawatafupexanez.pdfIn PDF document text
    • http://voijin.com/userfiles/files/13374496550.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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 17000 bytes
SHA-256: 9265b61667767478944e7727c14c168dfdc1d1ceb247fcda27ac0f4d46bf2bd1
font_01_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 10800 bytes
SHA-256: 9ea95bcfa679dad3f2acd395ee0b4abd1e2beb79a7417e3660e7a9fdd63fa5be
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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