Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a7a9748eb7e07c…

MALICIOUS

PDF

67.7 KB Created: 2021-09-11 01:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aae98950c1174705f51f379034db4ac1 SHA-1: b90052acb2ba1fd3acb9e1559d34e9eeed388073 SHA-256: d8a7a9748eb7e07c304a26ac73adadfdf73f3f763061b1eb12a092de922c8b77
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded links, a common tactic to trick users into clicking malicious URLs. The numerous external links, many hosted on compromised WordPress sites, suggest a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=winrar+android+4pda PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16136166d3dba1---jabezotasuwoxag.pdfIn PDF document text
    • https://adikkedua.com/contents/files/radenatiwidupejowosi.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/39846266598.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/rejovexulelozejun.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xinekidivigu.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/76307093246.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/40670366534.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/69916895458.pdfIn PDF document text
    • https://msiutilities.net/documents/54364603549.pdfIn PDF document text
    • http://speckrepej.com/upload/file/sawawomu.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/37095613016.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/6485187471.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387947a24a8---runopotimon.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/fuzipovubarigomovosose.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/12622853654.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/81323652038.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/xujilumawubitixujifoxida.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/44939769292.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/madutojozogosa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1be99aab8---25222183985.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613954a475d9c---jowixagadonajome.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_off0000ae50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 14128 bytes
SHA-256: 7f90caad96f84b8d170d38334e7e27ac382abc098981d8f8b957b9ab90ad26b2
font_01_sfnt_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 10012 bytes
SHA-256: 48a944cc77e4892904deb051c51395b793f3276d03721d9fa0c16e5a9a8d2ea1

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