Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bc8bfe6824cbbc…

MALICIOUS

PDF

83.9 KB Created: 2021-06-29 04:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2af92a08e7fa47b40fcec2302d555814 SHA-1: a1cf0ed769000a703f448d71fde5f53893694929 SHA-256: 59bc8bfe6824cbbc09dc6b07ea9f23211739627f4cadc5eb03a64999da5c4997
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=lady+and+the+tramp+espa%C3%B1ol
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f79a1bd40---wowimobaw.pdf
    • https://mfdesign.hu/files/file/xaperuwetonivufemeruzidax.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97278be10c---kaxanixunabigemurabel.pdf
    • http://dh-life.com/ckfinder/userfiles/files/nemijetazejofotaritusagax.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/rd3kea5ga5a3joec3ja7rmbuq6/gijej.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/ed813c9cb2982610998dabbe9c140321/43035497488.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qb3m43fbkcb7ftdv83b3kn1gvs/95660218317.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/sjuta6lo7sthf71hv1uk0ogtf0/marenoxidesixape.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/3eklngfg333u58pidpr2nelsb5/woforakapaminenoxefubad.pdf
    • http://apexnepaltravel.com/userfiles/file/93745858136.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6952264e2---rijaxiduw.pdf
    • http://veterina-hrib.cz/user-uploads/files/suretupebini.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/9704394648.pdf
    • http://tele-video.ru/upload/files/71807232421.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rk97ehvfkqmplpec7qe6f9ft85/gokewixixipofotupupikipow.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/06639103ebb5bb12237b1905cb84330c/ralapusafaka.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4ebe39a2---94302057123.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b6ab113b---50442159705.pdf
    • http://tsg-edinstvo.ru/userfiles/file/173510451.pdf
    • http://nusratali.com/userfiles/files/10687716461.pdf
    • https://al-farh-iq.com/upload/userfiles/file/92635437340.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9eb9302b---jofodiruwilikim.pdf
    • https://nguyenthelong.net/userfiles/files/nukaziriguda.pdf
    • 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_off0000db22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16792 bytes
font_01_sfnt_off0000f334.bin
e0e4c2e136f46861bd549decbb5158dfa7068e5c186f048f55ae2e2c3d67d01b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 19936 bytes
font_02_sfnt_off00012815.bin
b1519d945d469a37ffe0feb63474f342d2583de603a27711cd64b2dafde09134
pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 10840 bytes