Malicious PDF — malware analysis report

Static analysis result for SHA-256 703441f762688f34…

MALICIOUS

PDF

89.8 KB Created: 2021-10-15 13:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2e01ac9f6a66ec95623fd7d64623c136 SHA-1: f73daee47f5de0a8dfd138c140b5cecf0ce0208d SHA-256: 703441f762688f34f66028e28b198617c078b6ed48f4b906323321a51ccc1888
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=ghost+towns+near+fort+worth+texas PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158f6bb225b6---73434726646.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/petulifulebebovejunaji.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/60971449100.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/70455590193.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/55746247179.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/vixuvononajedizuwes.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/25424f4c464557fc81fd02f94e5e0f1e/lolodoxawuxu.pdfIn PDF document text
    • https://cargotavio.ru/files/file/vowanabexepuxikowame.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/11972226016.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/17399936462.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/sozinabuzezubipolabivu.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/luribirewudajuxusij.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/dusixasixujuvatuwi.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/56393265517.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613345fce93f3---jobub.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/pekutokedewedi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6e0ca6a4d5544366c1caced971ad4aad/15004807698.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616649187bf2f---61155683278.pdfIn PDF document text
    • http://isvpro.com/custom/files/jimapegipuro.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/xefawotenavevebifowowe.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/rixarix.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/44626116684.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef488d7b59---gevajak.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8dd86efe---2904371166.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_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 10400 bytes
SHA-256: 0303206cedf5438aaf97d3ba43c8fd1ae3aa10f925eb19a980d621db8986dbda
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 18364 bytes
SHA-256: 9b3059f965684c955900095133dda8fad895199e7cb27fcd358f5814a52d3a55

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