Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bd3b422f2bf0e6…

MALICIOUS

PDF

109.1 KB Created: 2021-08-28 14:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c733965ea3884efd3678cb6a25c0e77 SHA-1: 33cb6ef5a9ed57f89063856dae4fce22edda5a2c SHA-256: a4bd3b422f2bf0e6da4d9344465594990cb2c9cec25d07d9bb0990ea3da2e340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://vilniausgreziniai.lt/userfiles/file/zezirogetapanerijaxaki.pdf In PDF document text
    • http://galettedesrois.hu/userfiles/file/91053915626.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/fotuguwoxosezisumatavozim.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/botorukutiwed.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/wovazow.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d03863f39c6---jekubevakaw.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/bojuwepazotofuse.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7jvo67d0civ4nchsc18uglp8m7/33136306381.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ipne68rs72ao6a549aup2o3sv9/zigagimefisugoletomot.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fatabitofemizuguwuvuro.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0d36df45f---wulanerazuv.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/9138727236.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160920e1d6f2c7---lufaxuziwidebuveki.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4afd8d97e---befuragenixanemefajalig.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0ba981388bc4c64a7435180f78868346/kogepul.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b4c0a6483bbfb27e3bf82c47a77e1a6b/19815280245.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0f89046c0---24915107100.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/fafuripaditivedakifasam.pdfIn PDF document text
    • https://shibbirs.com/media/files/gejoguzimewoziwaputekori.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/nibabug.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/kapinatupo.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/77891559264.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be8b8c85560---rubimojelofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=our+discovery+island+4+student+book+pdf+free+downloadPDF 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_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001593d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593D 11312 bytes
SHA-256: b45dad3378e93f710e85c3384158b08ba2e85ee75cd31e87b4bc7d971e7e559e
font_02_sfnt_off000173e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E3 19416 bytes
SHA-256: 764afcf2352f98852fa7b0dbe9726e28b630752726694cf7041e69efbc6dbbf3