Malicious PDF — malware analysis report

Static analysis result for SHA-256 c625e1992dccb19b…

MALICIOUS

PDF

96.8 KB Created: 2021-08-13 22:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 13f62e2a5f3faed8a59c603d05d71785 SHA-1: 0e32306061c1db1fca48db39765a07797352fcf6 SHA-256: c625e1992dccb19ba5d53c3bca74240451580cbd6e294621ee1af9c3d07683b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://krisoc.ru/uplcv?utm_term=fnaf+4+unblocked+mobile PDF link annotation
    • http://mjsolankifoundation.com/fck/imagesfile/65607846131.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/kivugufitezowimij.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/dusunut.pdfIn PDF document text
    • https://abeess.com/userfiles/file/12862521937.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/funedu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f161836f---totusibira.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d4969605d---vinovetaxiviwer.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/suloterigizije.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/relexupebebodumefil.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69bbae295---47511478449.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb35ca316c---mawumitasenularim.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/wamanekaj.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160705c3d14750---tosagigebosagof.pdfIn PDF document text
    • https://bselink.com/userfiles/file/vesutakosal.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607854b4c72ac---mupurapo.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/wijirajedatig.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/kezevovizupalenarexaxinuf.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0dc08f9c50c84335bcf6c6a7d526a3bc/posaloruzirupumilo.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/wenobep.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7b8c40c3---tumuwaruses.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6db547cd---99312929147.pdfIn PDF document text
    • http://beiks.info/public/file/6910255966.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/65340445515.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/ganoja.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3456623b15d0fecb753d0ee1d5f0e5d/kotupit.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8a1c4d7d8e9eb2613e719e6d5b0202c4/20395727179.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/fetavijakamisin.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 18304 bytes
SHA-256: 6bae5c333f0b01f254a70101598f7d5861a9ca9f5e8b7b80655019eece94fae8
font_01_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 16640 bytes
SHA-256: 67cd4328d5fd6e9134f1b1c85b1680a1a932e20a6f130eb7c914dfd2913d640b
font_02_sfnt_off0001438b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA2 10656 bytes
SHA-256: dbba6a015eda79b406570c64697d209d31e5a88d16ef5d6bcdeb7f924ab9f987

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