Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a87d213aaf3034…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 02:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 481f0d49d4e5f81d529ca614e76fc4fa SHA-1: 0c097292caff9ab0d6f3bfba4cb281e852370c4b SHA-256: c5a87d213aaf3034d5949c2d8d8139ce6773dc98802dbfee34befbfa771cf591
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nomylo.ru/uplcv?utm_term=monel+metal+is+an+alloy+of
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5esu81nmdcvubbdpkr2bkc0kt3/zitizuvonulenunome.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c885d6ac7ab---92129522737.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c18cc54301b---83525287723.pdf
    • http://hkalc.com/userfiles/20763134791.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/63992472531.pdf
    • http://aaaexpressac.com/userfiles/file/gudalipaximuxomovuv.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/mpfpmrpf5nmsbplnjvur532322/tetisujoxemenim.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/5fu61tsd98m9teoj6lu28351ch/22146897903.pdf
    • https://dodomacnosti.net/data/file/50598149782.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/11697e318b6b0dbce02c9248236f10f8/zutunuxovuweput.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f39312139---34349037069.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160725ba466285---zepimexowanisutojivi.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/82f597710346174dca893f28578521b1/devarosemuperiwowopejek.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/340f8342769d7c83a996fbd2ab70a428/fimasadewadexazodupujer.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/f3786c1e7c828e43ee776bfc3b8f1c68/kakan.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/42d6801df2cbacc4676e78e560c9fd1a/finujow.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/supizejuvudiwivog.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2009696beba532bf63b8bf3f5c7938f9/sewuje.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/88fc7e213edf8bd2c87278335936a08e/zamisufuvodejiwofuxudip.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e41f3bafbba5f476467b7609f674b5f/tupogozolowojez.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/25rdv3p8dghgt7fe1ske3gp1r1/93033273223.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4l9m2gmslghmtqp57tv4smutjc/86254225138.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8808e67fc---podinagodalotog.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_off0000ecdd.bin
e16f3da257e07f7aeb1a9c8b4ab42b2daac7da5403d38b1978892edb5e3966d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 19344 bytes
font_01_sfnt_off00011f9a.bin
b9521f94c6dce18f15916cbdcba3050ce7c567cc8a18e67a05c4872e7a18281b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 10384 bytes
font_02_sfnt_off00013722.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13722 16792 bytes