Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7acfe2dcee22253…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 16:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3381ef04dda51aa4551be5a53ccabee SHA-1: 73fde190f2885be2908b81cf53992722f41ce2a3 SHA-256: f7acfe2dcee222532bab0cb57c70106d47ac8eec731e456185aa5710e4ca6b1e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, with numerous links pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://baigiangtoanhoc.com/upload/files/mazoxap.pdf In PDF document text
    • http://sahrugs.com/userfiles/file/lenogoxafifanukawi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607860d81012c---47389941771.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/bomijefenajenilazifaj.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160950e7dc5a20---maxebufufesamisuri.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zexafudogixapovi.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/86764852129.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xejuzifazusu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/81084601811.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/baf08us06avbfmhgp2va1ipemd/2984718427.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c8bcac91---gebulugurixemawopukokugu.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/14450233054.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/navazute.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ad162cb837f---57346297221.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/85043852418.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cb940f1b81d---33573798951.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8d2456ff---fufinaxotijatipevojegil.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/90039171116.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/95407395730.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f151e0d08---xepamotezilokajazozu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/20406096788.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d315d1f9---soroparoporasob.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zowezowewusugefitames.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb9d759d5---zofatamowuburuzikuligo.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/96618103923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=2019+subaru+impreza+hatchback+manual+transmissionPDF link annotation
    • 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_off0000be7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7D 16600 bytes
SHA-256: 0c9ea70efbc76ebe527cc01277c0618a064608d2ec00960512c1c13a46d3a300
font_01_sfnt_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 11396 bytes
SHA-256: 8d6db56e5a0339514fc41a2add6dfc54122199d86f4e8275d3693749f73981c2

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