Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeee934a8ec98ce…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 12:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 597a208094859f3a349b00fcc8395139 SHA-1: 59ada3b5b24f87f7c4e9b62886f9d49948548632 SHA-256: dfeee934a8ec98ceabc118abc0b50e7bd0535cfe7cc3ba6b64b2a7ba6982b7ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, a common technique for phishing and malware distribution, with multiple URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking malicious links, potentially leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c692793c9af062bf6ba4509be4698b2a/25793586926.pdf In PDF document text
    • https://angkagenap.com/contents/files/25375101170.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/9d0a62627a04d6a01a5b0a2af2aba5a6/59261066224.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/burojijuxezodarevowugiz.pdfIn PDF document text
    • https://matratva.in/userfiles/file/77310462874.pdfIn PDF document text
    • http://htwy.com/upload/file/rakifixanego.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/bazutopavaja.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/76769818551.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/13879073725.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ed3e6f7558c395c7cdec5c9366967378/semeba.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/96346069742.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/17898304265.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/56624933027.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/35197719514.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2e63be954238a8386532a685e6fe5bf6/bexowuvug.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/lunuteba.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614188c0c9952---61052895707.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/busutezukususoge.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/71257079967.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/59343539366.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/30645001544.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/4764147442.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/wotajofuk.pdfIn PDF document text
    • https://diphong.com/uploads/30916623346.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/budifuwuvowawowesaliber.pdfIn PDF document text
    • https://artenika.pl/fck/file/36115830907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tubemate+youtube+video+downloader+app+free+downloadPDF 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_off0000b3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 10960 bytes
SHA-256: a3726c87bd06a411e6c073473148078ce791594222ece2e1af0337826abec021
font_01_sfnt_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 14712 bytes
SHA-256: da8c12ba5facd97828795e70436456ef8e29b4166ceb5cd4972fb584c6ea159e

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