Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb8d9772e2beb01…

MALICIOUS

PDF

77.5 KB Created: 2021-08-02 01:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5df59c30a6c90f72d07429cf8b7c9374 SHA-1: 8b2db5d928d6c5c0b271dbb5050a51e2f0e65fa8 SHA-256: 7cb8d9772e2beb013b2781600bbdbedca98577ef91d87885b58b7d16e0ed88c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medob.org/SITE/files/editor/file/weridenaxozorejuzuno.pdf In PDF document text
    • http://angeladaniel.eu/uploads/files/duxejojizanojuvawirowadek.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce02fbb172---jitilinevox.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889686ec82f---45475091792.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/62107298444.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/8879314321.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080615ff21f2---mugizanajesurujeduj.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/78740820331.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/7251328277.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/83284647637.pdfIn PDF document text
    • https://peterdegendt.be/file/tepawozuzojetavilexovob.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/72337619071.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210614_A34F0039CE1A5DEA.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f215d2ab---farexilipafarotuvuvosur.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/51708036002.pdfIn PDF document text
    • http://airsoft1.ro/files/file/kuvisitajosawosawewewiju.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076063da1da2---3822000087.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/texogobipejaju.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998043c7e17---42813596198.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/xopojolefikovenikomabuz.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rq75sipvajt50crso45tkpaepk/ruwivusonelawasekazile.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/4316737182.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6ab4dc20---gebuxozuxuga.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/kobemuxunekotigesodewufa.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/44515944986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=%D0%B3%D0%B4%D0%B7+%D1%83%D0%BA%D1%80+%D0%BC%D0%BE%D0%B2%D0%B0+5+%D0%BA%D0%BB%D0%B0%D1%81+%D0%B7%D0%B0%D0%B1%D0%BE%D0%BB%D0%BE%D1%82%D0%BD%D0%B8%D0%B9+%D0%B2%D0%BF%D1%80%D0%B0%D0%B2%D0%B0+429PDF 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_off0000bd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD22 20872 bytes
SHA-256: 4683036d9d799e484f51068bc5c964be6a6011f039d10dc16f60b412b61fe363
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 11584 bytes
SHA-256: dbf4ccacdd578f6066fe4c16fdf33d927ad46f6c0ccf8f56ca1174a74fedf595

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