Malicious PDF — malware analysis report

Static analysis result for SHA-256 355e40cd7fd449ac…

MALICIOUS

PDF

81.8 KB Created: 2021-07-16 17:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 936b6861b6c69100a3723f6f2f0e61c8 SHA-1: 223e71ebdd936034d75881f05968bc70d3ff5a13 SHA-256: 355e40cd7fd449ac51c2d20aa3097971aaf80f89515524615965e23433556c99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://manenshop.com/upload/files/48637889785.pdf In PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/6a3e90al7n6vsp0n64npshqugk/61308113276.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/35079718968.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/15331194938.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad10118c4a5---kifadonudomiguk.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/nuputum.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607542abf0b17---murogasebe.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5cb00f39---35534208948.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/dazamezenozuxugazuliz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/laregul.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfa0c4714---bosutolipiraso.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukfski1hspeh8niab3gc9sieuj/92771455459.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/91676585993.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608752ac66b13---wuvejigofewurevenerov.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c0b6ca93---pakadit.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9ddf0b14---91388955771.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/vijawotogumaja.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/gawunukukokisuk.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea924463dd---65643900812.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb94b7b16---71692518206.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/95672595124.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/mlme3kshl7d1d11f4ft3c4tscd/zezedorutatesubagidir.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/47159288919.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/23609013785.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/nigakagavulogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=4+pictures+1+word+4+letters+answersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c6379edf51756ba265b56696cebde17d/fanifipafiboji.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_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 16752 bytes
SHA-256: 762a4b2526868021f61138de11688d6dd9bede443263024077515e5267501285
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10728 bytes
SHA-256: 08a360f5f7581f4b800ac24843dab3cb41e530d4c61cfa771b3c95b90e8f71d8
font_02_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1