Malicious PDF — malware analysis report

Static analysis result for SHA-256 9536bca5508ebefb…

MALICIOUS

PDF

83.1 KB Created: 2021-07-15 13:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2863b18cfeb10dab9b31e098f7902a67 SHA-1: c5b8e4cda644ff7147abd47e620df99b973f679a SHA-256: 9536bca5508ebefb9dbab26e7c8544b856ac52778e37a25173df456f9f406be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm hosted on a compromised WordPress site, with many distinct hosts and links. ClamAV also detected it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous URLs and the link farm structure strongly suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/b2adv4v3abdaquvcebvmrf52c5/bajinedadotezowidobu.pdf In PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/44360791614.pdfIn PDF document text
    • https://argumentua.com/i/file/pipotimag.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/viwutekinaru.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160771139b86dd---8300007092.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/55988430474.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/resobabetigipulaki.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7kpui1sc759nc376420mgqk0r4/panurojopafifadobebezosaw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/487636b4aa9f6e07be0730c1646e9428/65737133636.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/viloga.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/63648829889.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/gukuvinokofezotomojir.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f2d0c45dd959bfac77f68c113044d83f/pidamironigif.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/47119304177.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/53860803786.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/zepujefusoxe.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/5d97snp0aem7tjt430bjincgi0/pigudenu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/42205637604.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a942f89efd7---50080013372.pdfIn PDF document text
    • https://t2sc.me/userfiles/84494157760.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqib8hd6ajhkmh5socfp1al5d9/17003995504.pdfIn PDF document text
    • https://orrizon.ru/images/file/45202101528.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/bodulapivomusorifapenazos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lack+of+autonomy+meaningPDF 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_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10628 bytes
SHA-256: 0c0a6daf800c41d8b9ac999416fcc9589d650963ddbd0dd095755853efbd19e5
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 17044 bytes
SHA-256: bc41b900cf1235a8fb312411bfe6ea9a8805a7f1eb5f465ace1d68a662f9985c

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