Malicious PDF — malware analysis report

Static analysis result for SHA-256 874d7d301deb9522…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 13:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc9cedc3d8bdf841c137ec768c863202 SHA-1: acf16dfecb63cb4aad92672838667bc7e2ed924a SHA-256: 874d7d301deb9522a85476fa2cad8dae0155c8339b4453997404d317f4f45846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and links to compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://insidethedigitaltrend.biz/userfiles/file/69424798483.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/22a151f3a0a34a9fae378e2357035a86/31702290251.pdf
    • https://amd-export.com/site/upload/file/20048141323.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a6380fe1---39931480197.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mq6bpah89qc8o778ecilk7mgq2/wufofotofokon.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829831a086a---kemupozowokinovezirox.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae0d6fb55---10634090937.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9d604ffd8ae482919a109c7666f4a52e/fejizevexotezokalix.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/57a31f280b59d96f1cf38ad5d3d5ab8a/kebaxe.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/87l93tclbh0tglsljtjeroq1rs/68262459604.pdf
    • https://avenue102.com/uploads/file/28932055282.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5c43d30b6b3b97c67891395fac61c7f5/89588671975.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/2395786602.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7969bce4---nulovisezegibajija.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0760c8fe---sosijeneduzogaso.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cc88b890---duzadesubufedagebefo.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728dc09fdbd---pujikikazenewuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dry+shampoo+makes+my+hair+greasier
    • 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_off0000eb8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 16792 bytes
font_01_sfnt_off000103a6.bin
60e3c687f1c190455778eb1a961dc058482e8b5f357e69dd7a85d4b26f94a2de
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10656 bytes
font_02_sfnt_off00011c13.bin
ce48c19ab65165b04381425e333f9d52e9be35647633fb6aaf75e7a659025722
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 17436 bytes