Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13e9c64f0bddf76…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 11:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df8ba85bf1dd6a27be8e8260df3b32eb SHA-1: 4bb22bc75aa38a1c2ac7e8f262fe190f9fdc2edc SHA-256: f13e9c64f0bddf76547accfd33ed95c7f3d3b175b971b15b27a0e450fd4a5fae
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://toszegisuli.hu/userfiles/file/31637852649.pdf In PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/78787464857.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/kajezumemavokakebix.pdfIn PDF document text
    • http://steinemann-ag.ru/33059504272.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/17606635364.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/milubexeliregu.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/34191807454.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/basaxataxunavuguxewopamud.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/39764844680.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/98811102538.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/80145972056.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61c1478e0---56983222167.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dffbecb5b---90385724491.pdfIn PDF document text
    • http://unibox.lv/files/text/51864153017.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/regawa.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/davup.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109041531201266.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d07ecf58197a851949aacb869ee2675f/60935344245.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/dedavosubujapimo.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/bukevusixabefunakux.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210913_084433.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/tepalobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+transfer+photos+from+mobile+to+otg+pendrivePDF link annotation
    • http://irodori.kir.jp/files/file/suzojosegalapalu.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_off0000bc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC92 17160 bytes
SHA-256: 26e7095a749595ea29e39b86f8640a302b2bc320205b7e63bdd368cc58d6f524
font_01_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 11228 bytes
SHA-256: c51024cd64ebe6d868aff1e67a22910966060724bb10ccb2fc9b823dc33602dc

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