Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d12a0fade654b06…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 18:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d866bc56e5a7771c83e47004445b9ab SHA-1: 58f0f5b523b49cc9aebeb959293e1c601ffd04f7 SHA-256: 5d12a0fade654b069d2996a34216e80b814178b9478bc35793a5fb21b5a47a79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=investments+for+beginners+pdf PDF link annotation
    • http://studiomarazzi.eu/userfiles/files/jekitamizuwutiwilaj.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/zotijuzi.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/95452785758.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7524791c69---54252108452.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/66675650679.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/zawamagiloriberebidapu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b948550926c0c1a617228532fd9e8c34/48925314301.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a09d43d7abbb1399a0b10594dddc9e82/rukobiretavezolufamob.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/23125748701.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/h7rekgfoto3c9ifh5n9q1n7ia0/76958750882.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6c400932---33844721771.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836686bfe9d---xikosuguviwavafidenufapip.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/18726844309.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ukarozobovopapejugiw.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16124ed6095778---xoraxar.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/dekapixikamidifuti.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210531034232.pdfIn PDF document text
    • https://diphong.com/uploads/45144789953.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/kigixojapofisetemiw.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/xewoxakos.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/91cc7f6846f6a24a413a5c6a835657c5/57707254952.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc520a8f8f7---powiwaf.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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 17660 bytes
SHA-256: 9525a54bf3f339137458a15fe41c0c8c321dd8363b3cf2ed118ed4b11b639389
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10788 bytes
SHA-256: bdfd013e83ccb7c5dd45958d159d9e4ad7e7aa1af872df0989f7da478c1d6b2a
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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