Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f152bfddfcbcba…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 15:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 96513ed479aeb6ad17a562d2e7d81372 SHA-1: a416e36e8a8ff9b3d2cc1cb53659e40aa8e9c999 SHA-256: 61f152bfddfcbcbac8163a8b673134b4edbfe750b4230e565a7438197f5631d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded URLs indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/648622a1c9058dca03c5ace480741349/jugutuk.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210508180940847.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/667edc058e28e2e665f8000e224ae134/27764733629.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a6afc83f8969b4384b4998f47cc348d5/477689719.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/89102533616.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k7uhi5hanfg0b39lmv9a6tq9u7/wanamemizevizajanonazor.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/8acd9a0427e3a8eabce21bff8e3c9660/90519382238.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/fafajepobufofujazasotuma.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/zagotejozorila.pdfIn PDF document text
    • http://nessium.net/userfiles/file/96638512326.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/mobojofaxuzaw.pdfIn PDF document text
    • http://bociany.sk/media/file/61285796549.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a734d77eca6---36439576342.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6e89e9eb---87357149101.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/1c91vn86rikpqter56r62birro/69222946753.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/45171657842.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/51dd3cb7953475d5d9435a3fcd1e2669/xupidoteju.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/gupedomedunitamaxejumela.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e42f69d1d---guxivuzug.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dfb29f330---bepofijefiguwimux.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ede32a38e13b960562ffaca4712f427f/69118368649.pdfIn PDF document text
    • https://aokman-drive.com/d/files/gaxopomutukurodelewuvit.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/23953092816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=i+had+a+dream+my+girlfriend+cheated+on+me+with+my+brotherPDF 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_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 16952 bytes
SHA-256: 587102ecfc4781e5bbc9a7a4696971cccb51397fcf8ac88d5347951b308b8941
font_01_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 11048 bytes
SHA-256: 4cdb3925b39cdf77cc80435e6e0ce387d5b4d18128b90c43e9fa67b2c85f8a53