Malicious PDF — malware analysis report

Static analysis result for SHA-256 1055e037c9ebdc73…

MALICIOUS

PDF

89.3 KB Created: 2021-09-17 08:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c326e8e723846ea317fa0258fb1a75ba SHA-1: a5934777fc24fc2e2736f3c559447d15299ddb3e SHA-256: 1055e037c9ebdc73792bf9114d5aa51a386e8d991ab6065ae6efa24301f21693
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and link farms, many hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of a QR code lure and visual download buttons further supports the attack pattern of tricking users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=happymod+app+for+pc PDF link annotation
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/78062110513.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/navadujetixofofubi.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/39012781684.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/79137279408.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/xipusifitekotoj.pdfIn PDF document text
    • https://masukpt2.com/contents/files/juwajabeduduzusiwub.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/94b5qlj369otd3p8p0mb0op50m/buwewapu.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/21085031161.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/21139585422.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/bazodo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161342169adcb9---vizunatabinuvuji.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/bevikotepis.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/27254480233.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/puvot.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/15286875086.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/rowuruwapovozefigopulove.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/18571257691.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161394e9a96666---12929489852.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/masomokumomamopipagaxa.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/madowumilovuvolawov.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/tetonimizegusugar.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191101115871.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/40452421474.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210906193521.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/52896460672.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_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 10248 bytes
SHA-256: eb098599d17a62c4f1cd35f50eeb0dc5edc75f7aa9ca419e5e23f339f2208b79
font_02_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 19704 bytes
SHA-256: 2ad69123f5d0daafbaca03164205f35a90a06076c07fe82b668f63cd51239a9b

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