Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82928e874b9a931…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 12:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f34c727f876e007462c3f4cd4fbf4032 SHA-1: 284666fc09a302d508ca55d4a57df50e3f840927 SHA-256: b82928e874b9a931d4f51b5cd92bd9286d04727bfc8070249f7fc51d6fc4c3a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing and trojan activity. It functions as a link farm, directing users to download APKs disguised as 'unlimited money' mods. The links predominantly point to compromised WordPress sites, indicating a tactic to host malicious content on seemingly legitimate infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa4c5257a---nizowegekosusokakuwu.pdf In PDF document text
    • https://taucaotoccatba.vn/images/news/files/62512945350.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/xegikejebesoxegani.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141e28ed3b72---98959455678.pdfIn PDF document text
    • http://cold.lt/userfiles/file/82141934714.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1ddbccda---jupoputiperijub.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/29547776175.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/linogidosawupux.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/41692690977.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/jojozevikituk.pdfIn PDF document text
    • https://reha.bg/content/upload/file/90328017260.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/73790972800.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420cdf68282---vulavudozubifodibepifetid.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/52271596068.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/42714360685.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/kesemupupozemepaweneseg.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/50808997093.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/papukonezixiw.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210907_32CD8ABF3534FBAD.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/63328085981.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613146f1ca7bf---43018975379.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e66f0e8b4d---dabewig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=loco+mod+apk+unlimited+moneyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130becf4ac4c---xobugazaden.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 10668 bytes
SHA-256: ffe72363921edb2cddbab1a6d535580cc375d7db502a8f7f45d22dcee99931b4
font_01_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 19240 bytes
SHA-256: d62ce95bf98fdefd4d349bd3fbcff0328f451fe243831d5598dc16929fcc9676

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