Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63036839bfc351e…

MALICIOUS

PDF

87.6 KB Created: 2021-09-21 08:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: beaf759e1474bfec620e8cd1ed1162d7 SHA-1: 336531588f54c86b0b1179999c0eea753aed1183 SHA-256: a63036839bfc351eda15ea583db4d4131e4f2548a3237060c0912d07e9a927fd
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://medvor.ru/uplcv?utm_term=video+zoom+editor+app+android PDF link annotation
    • https://ykitraders.com/UserFiles/file/kokukusisijijikixa.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/pipodirepu.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/42609610725.pdfIn PDF document text
    • https://citytrafik.nu/images/file/jejiwavufelavejixeji.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/tivetimesifosagiwijunuk.pdfIn PDF document text
    • http://samtekelektrik.com/files/29747393736.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/15865618760.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/gokozotowiburafukafusu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/65140811645.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109110115515050.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/fovefugo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410fa418e70---rimub.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/salolamomiwelinofox.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2420b8ae2---3362378517.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/kitegewiwega.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/93962474046.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/87360162245.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/xitexa.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/aed7fb14132bb1656345a42826d21257/42060817129.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/10089939517.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/suratamekizusob.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/sejubib.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/68533321269.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6db2a1c119a7efd82598530e6d7854e5/kebazajofejir.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/82800476486.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_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 10368 bytes
SHA-256: 0065f59993b47c89e24d3cfd95609548068ecfea6325d191f331b496c658ea74
font_01_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 17624 bytes
SHA-256: 05998130e9eb9617c0e7b5bf52616d7029555c1784809d7a13f28d7f1a82e884
font_02_sfnt_off0001388e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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