Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd130379194c486…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 17:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 262e18866dd9df35bfa46b2774405aa8 SHA-1: 9cb27bde7eccf6bc8bb868ab365c7fb5d6538e45 SHA-256: cfd130379194c486e11fb2652b9233bc0c810acfc724739d8b59644f8c2a24d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm heuristics strongly indicates a malicious intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://bisenzia.it/userfiles/files/69346606695.pdf In PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/zitesojun.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/16426592328.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/78d575fde73d40285f78d9043208c6e3/voxupobulabagiw.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613540fc64917---11840349082.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/89797298481.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/winubokonawobanofedovu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ba4700b1c---97959631921.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145018eec9a1---22113943050.pdfIn PDF document text
    • https://huanghecables.com/d/files/75595944844.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/busopabagen.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/gevirodewawakawodirepo.pdfIn PDF document text
    • https://okul.gencreklamajansi.com/uploads/files/kijeravebawexafivagexifod.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/95985053705.pdfIn PDF document text
    • http://computerdoki.hu/user/file/76264651710.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/48551439890.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/lawabizowirono.pdfIn PDF document text
    • http://holzbau-napetschnig.at/moxitosirinogabowit.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109100400001301.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210902_520320FF0CFF26F4.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/54358312428.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/da8e84a3ba707151b726614884176569/29920167522.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/64164569527.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/velonokugugofajefo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/gejokatimapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chrome+android+notifications+spamPDF 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_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 18116 bytes
SHA-256: 147b012928421b2a9768aa2aa3c49750dfb5449df9924d58527ec5f04c1e477b
font_01_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 10868 bytes
SHA-256: 55c6a719b4eecb4edfad2d4c97f2ba9e1b01297596bed653ecb2c41ce1333084

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