Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f11e092b1e17493…

MALICIOUS

PDF

95.9 KB Created: 2021-08-09 19:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25fe2db41b1f27d6b0be0c6868f1b1b8 SHA-1: 661a920a016d9f91575eba065ae6235498a16a2e SHA-256: 8f11e092b1e17493c0184248f339ec7680c7abc77994ae344b41aa6d7d6e3afc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://2440027.ru/upload/file/garapadapoxoxonijerutajo.pdf In PDF document text
    • https://plasy.com/uploads/file/19925721941.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ce59c0085845ede38da5ceb69022b40d/44018732616.pdfIn PDF document text
    • http://ipllaser.in/uploads/sovinabosat.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/19003965114.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/xuninaxazeza.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2eff6a1aecc0ca4e5d7a1cc9482f6904/lanuduravirawidisamiki.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zidawikaxi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3e8e575f806bcda88a740288b8a269f2/41699081002.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/32708195780.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/lowisesisanuvapud.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ur0jpvm041u4na9lep1sl18geh/95722094141.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/89363336501.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/laxanezone.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4a341a231---29235077218.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9bce5b558---dorojotowenanibulo.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/xuwofadoleruzozozap.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/rijenoro.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a470bc426ca---16550964413.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/48074835752.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe34e12b3---xulotidoxabexizat.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a6bc8d8---vukufenorovereb.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/lusopolunaj.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/bugudejozutagaberifoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=adding+and+subtracting+negative+numbers+worksheets+tesPDF link annotation
    • 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_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 16292 bytes
SHA-256: 83ec357364d7fa848fc2d1540b8d7989d1caa5a1e212cc9711c1b2329d61a539
font_01_sfnt_off00013e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A7 11236 bytes
SHA-256: 47221ee3422c6d2df56fbe3560f8ce7fe28c18360146859c893f55e49d1837fc