Malicious PDF — malware analysis report

Static analysis result for SHA-256 53536013e7d7c00d…

MALICIOUS

PDF

173.6 KB Created: 2021-08-26 07:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ae83b4b5ba4f3149f3c5a01867d685e SHA-1: cd698da2dc71b3ee5b11fec6517b932d48ab5f01 SHA-256: 53536013e7d7c00d3eb8259e5b9010fef7c30a277fc11c55407c1d05e90d6299
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a malicious PDF downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5875

Heuristics 5

  • 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
  • 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://akinmedical.com/uploads/file/jomiwaruxobemobujabod.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/piniv.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96ef77c0d---wawisujenumirigosu.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ivv32q1ceod07qp174mm8mf0nh/tibiximufot.pdf
    • https://acrgroup.nl/userfiles/file/gewipadidorubetisulupolug.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610485ebc8bbc---niwunakawezumasasepatu.pdf
    • http://goref.ru/files/file/39238236004.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a17691f73---10937009804.pdf
    • http://caryhigh1987.com/clients/41333/File/sutajiberivisototedi.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01e54b201---52938823642.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/61105650741.pdf
    • https://mraos.com/web/userfiles/file/fijitipajajutogoruma.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e27c5b7323---monazimuje.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/90ac7595c2dc3138c2fdefc45f043e82/60869912675.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/57daae28f1046c28d51051a6694a002d/21338708607.pdf
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/xawabazakatepofeka.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1c2466e7a7ccefe5a0570cc6e4a9bca6/woparujabujakugopamafuj.pdf
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/totevepeworuwit.pdf
    • http://innotec-industrie.be/userfiles/file/37366967805.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/gapomi.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160771fba5925a---pudazukofer.pdf
    • http://technoculture.cz/admin/upload/file/96894756149.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tcc0atqtd5h232vbomo85sjv83/20301267158.pdf
    • http://chromatographvials.com/d/files/33711536074.pdf
    • http://skyparadisecoffin.com/images/media/files/18991185354.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc0787186---64025814568.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=10+addition+sums+for+class+5
    • 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_off00025a84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25A84 16792 bytes
font_01_sfnt_off0002729b.bin
7ad0956a745eb24498dd4fee7e4808ad34c79666a55e404a07f1a7f927fff408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2729B 10816 bytes
font_02_sfnt_off00028b8f.bin
ffd7772fd692c82481c28505f6cc98214e4d62b44152d06fbd177ed8afa43e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28B8F 17228 bytes

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