Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bafa25254ad29b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 19:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0603fff1271b59c2c5cbebc08b1b1597 SHA-1: 5d5875d57dbc0356798056365ee97e798b504754 SHA-256: f8bafa25254ad29b0769b491a94046bdf6e8432aa56007405cdf90433c84c565
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tsegypt.com/file/netibisufidodomuwomex.pdf In PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/71783787832.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161444030ddcfa---vupoji.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/vitibutedodewi.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/17900428729.pdfIn PDF document text
    • https://trainova.com/userfiles/file/11067230589.pdfIn PDF document text
    • https://petala.gr/userfiles/file/32691878642.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210902_A5ADFEE8279CDED9.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duzijudomovazuru.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/binisebelakazasapinewovum.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133f44e27a2a---83069244572.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/xorizolubezi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613489f0a1d3f---16761536728.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/1811413471.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/70202451056.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba8a5b210f---powebuvozo.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/gepijijixod.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/vogimevup.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/jixerere.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///bovezikawedopilib.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/futakuvonelivixorirogiwa.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/rudupeniwanusa.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/16077843022.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/60009323290.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/99340780961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=where+is+gallery+on+androidPDF 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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 10536 bytes
SHA-256: b0327eb87b1365eb2230892f3c5fa3435365ef6f66414b0708d95518515b0e60
font_01_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 17520 bytes
SHA-256: b03cff88fa14b5f08f3814053b9748a2012e4bb74708581818e999f9d14402de

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