Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c1bd14392c9a2a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 10:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55223eabfb842f0b756f47c7998a3600 SHA-1: 8deb2eb33960fc6c76d1b3fc8b5e72097013fdd3 SHA-256: 31c1bd14392c9a2a3e6e1a128397bf0eb394279193f5029203af65277ee74e37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=app+per+scaricare+film+gratis+su+android
    • http://magyaringatlanadatbazis.hu/dev/_user/file/guwupewe.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/molisawobupebavime.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161340383b1085---jijokukew.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1d49ee9e---96950082915.pdf
    • https://cartolmania.it/file/62613532818.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/44327034178.pdf
    • http://vecsecity.info/editor_up/26436597907.pdf
    • http://zeci.nl/im/image/vasiwilizagov.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/bumenomuzulo.pdf
    • http://toflight.mobi/attachment/ckeditor/files/a0491bf842efa63466c464deff94fddf.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/55882881262.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413d06372c6---firosifegefumigufupiteped.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/3343535421.pdf
    • http://oreoltour.ru/sites/default/files/file/4739036045.pdf
    • http://giteduguedesboires.fr/userfiles/file/92658864334.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161425334a0747---gudigokof.pdf
    • http://trevelci.ru/ckfinder/userfiles/files/sesigune.pdf
    • https://luminex.pl/upload/file/suxen.pdf
    • http://anael.fr/fckeditor/userfiles/file/lomolakawizerazew.pdf
    • https://iva-vietnam.com/userfiles/file/tegataxopivoxuvemefu.pdf
    • http://roosprommenschenckelfoundation.nl/userfiles/file/73721677660.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/6100154306.pdf
    • http://tce.vn/imagesflashupload/file/4618398848.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d452.bin
5d6c27d10e3ca2d00d3eb8b4421df1b26d3082e8effe3d7e314b30748b11e3bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 11044 bytes
font_01_sfnt_off0000edd9.bin
4693f31f2b9064a8ff759a926635ece11b447582260693896a3f0dbf55d82d90
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 16852 bytes
font_02_sfnt_off0001197d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 16792 bytes