Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c24902ac4bb4bbc…

MALICIOUS

PDF

88.6 KB Created: 2021-07-20 20:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5aea8bd04f6d88c5650bda2f79ae1d6 SHA-1: 0857c3b87458e8a375028b198e7276f62f99479d SHA-256: 9c24902ac4bb4bbcc91ecc28ed517b895f07290639934ab20cbee8d343254e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://europacreativaeuskadi.eu/files/galeria/files/rawotaze.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d032b03b64---wezafad.pdf
    • http://ingenermarket.ru/userfiles/56282828432.pdf
    • http://bajajsports.com/userfiles/file/78319013474.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e190a9975053b9dad1a9a537466926e2/lananudafute.pdf
    • http://houstontca.org/Content/uploads/files/sarabuvukapovusebit.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d33ae98e2627c09878ac85ff238c41a8/rabip.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/f1ngsd6ipq39rhhrqj7p0nou41/vezonase.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0766bd622a---11380827588.pdf
    • http://ytbozhuo.com/upload/file/021845492089.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098be4a7ab0c---29156518877.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/3718203495.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gukolute.pdf
    • http://fdscience.com/UPFILE/userfiles/files/27717442817.pdf
    • http://mousike.it/img_ins/files/67963157273.pdf
    • http://fkjz.cn/upload/files/2021/07/202107060624125635.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/4548434232.pdf
    • http://wsm.hk/images/uploadfiles/file/doreli.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f588429bfd9776a568eb983caef561b6/16874249656.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cae46071042---tuxozenotosef.pdf
    • http://elsekmont.eu/userfiles/file/91756077147.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dff529397d---85205330219.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/61779257084.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7r9d6qhfrvv7hi00q03chvbn9n/muvadopas.pdf
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/jomidebunupasapasodukaz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+gorge+nh
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000fa4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 16792 bytes
font_01_sfnt_off0001125c.bin
187e6147b817b49f1517f6ca696e284db13e20e962e152c1b9c146ab778dcfc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 17432 bytes
font_02_sfnt_off0001404b.bin
449929884b6d95d197cd03ed3448046022afb11f88e4ba52a8e9632e939e0ed0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1404B 9784 bytes