Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13a7fa84e1bb00d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 12:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce664ff501f70a900f93ae89850b94d5 SHA-1: 6f6e5f8a52f13d0976f9bed6ff9ff6bf8550de5b SHA-256: e13a7fa84e1bb00d1aa68c01d78837965bf10f80a62abe39b7c8dc893011c1da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=dolch+word+list+grade+4+pdf PDF link annotation
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/40688149740.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3921c28c7237517dad715bcc28d953e7/sizubagowejum.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/wokexugiduviwuzofasafud.pdfIn PDF document text
    • http://teplospectr.ru/images/files/xugonopelopawuxalesig.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/kiwusabifojejubigiselejaf.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/53236334187.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709a6093e1c---21976983196.pdfIn PDF document text
    • https://grandegroup.net/files/58056062549.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082572c4af41---zusasosimu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c66f0598154249dbaaf5d8917ba3e2b1/18938967070.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/duzojomejelugiritazar.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/49241217840.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/78193025221.pdfIn PDF document text
    • http://e-hematologica.com/users/file/goguxexise.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a086b4598e4---3843271351.pdfIn PDF document text
    • https://luminex.pl/upload/file/kedizigerekis.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608021326fd82---bowixinuw.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/dinotamutufafidapufefuwa.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bc311157---lipovafiguk.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/30571307182.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/83111691798.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/juletavajutonivugi.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108211503412484.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_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 10960 bytes
SHA-256: 09271f2acb2927f4d941fd89d1443ab176c3d146c181b4761b95c6c9c1f80884
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 18012 bytes
SHA-256: ca5d3eb80d2db11faf2c5920b05e2b2fe0be6b1e428e8abc080a1456f2a227e8
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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