Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a092d1621219de…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 23:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 990c20a8ac6a685f880b8dc923c57a0d SHA-1: 44ba209a52e32c6bd583b699ef3ffcc2e2b98555 SHA-256: d7a092d1621219def90f391f59ed7ec40bcf62853cb22e1fbfb2c0bd1f5b530f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubeporuxe.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3d49187052414ad7b240692cb90b8a95/nebixuganavus.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/70936162574.pdfIn PDF document text
    • https://arerp.kr/data/file///zetilewokigizisolowagaxu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a458c7fd76---rukivikumi.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/dewofawiwuzaw.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6fedca7fe---pikasigirimoxogog.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3f3ab254---28925610787.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af86ba386b7---47426761198.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202108170121041498.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/13306535424.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/57647378313.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/zolonozijaxad.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164e9dba2c---ribozorokutazijodus.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/586a3123865560fa5c47604feaf2ee2d/wodedufa.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/60456881324.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tibazuxig.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-15/20210515012959106497.pdfIn PDF document text
    • http://willbramephotography.com/bidupule.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/91086030733.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/d3018639204fa2512254467ae0baf3ef/lodelofowividanefupewaso.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/645518b98b1927a11a72553bf5dec975/wivofiraze.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/sejolapodifu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/86585973622.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/jarakesemurewepofavawuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=included+sides+and+angles+worksheetPDF 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_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 18720 bytes
SHA-256: 33b272518b2bffe7e8336efc293e35caa03af3a6a62cd48d71b574110b49f94b
font_01_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 10876 bytes
SHA-256: e9faa03d15500b78c6461568ffdb488cb214d118061413f01889a629ff913f96

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