Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59af18a71362194…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 07:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d2a719f7bd863ea5a8edd3bb16ec2f1 SHA-1: 1e23784d5ef9ae273a6b8b844e129a76a1e53df0 SHA-256: e59af18a713621948057b69d9d5af912a50ce1d9d03c92be8442f55162757c30
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kapsalonindex.nl/images/uploads/kapurudu.pdf In PDF document text
    • http://amindoost.ir/images/upload/files/63123927414.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/mubivomifefigunegixedipiw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bekumufiluwororimes.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/15736889299.pdfIn PDF document text
    • https://ikansambel.com/contents//files/50360710492.pdfIn PDF document text
    • https://somogyplusz.hu/files/tusoze.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1db39c06d4---xotakulapupum.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/xejuninoruwexikuwusefomin.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9460d7e8---76498669285.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/78329784955.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/49851721470.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/96426306282.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/fesebusijimagum.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/83406621917.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7784295f3---sovivavubejuw.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/nojejevofu.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/somuruxarasupupad.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/jinokapajubumol.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c35870c051f599ce771c1455433613e0/zabowegerulolotapamok.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/dedepijozigixofosowa.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfd41b144---88360749844.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8c4502597934dbac4174a691a40cb426/42258933337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=uttarakhand+pariksha+vani+2019+pdfPDF 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_off0000bdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCF 19172 bytes
SHA-256: 4da70737f67bb3de5498d56ac589daf76229405b2fcc35314ef8d1023766353d
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 10924 bytes
SHA-256: e897e29181a447bde46d74f8c8f8d3ea97f64a77983e7739817487f5fafb1be4
font_02_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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