Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f88dcbb2fd01ad…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 13:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7debd303514f33d09df136ab362f6ddb SHA-1: 0bf70f207fff920fc81c405996490caa15601902 SHA-256: b7f88dcbb2fd01ad42f2908bacf2c8c599b6ddcee0e92d99d8c9bce6a5b29949
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9976

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://www.salpasafarit.fi/tiedostot/files/xevumovoturinebixux.pdf In PDF document text
    • http://www.nomorcantikjoss.com/file/92411264213.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29a6f4097---pewoj.pdfIn PDF document text
    • http://kccmaul.com/files/files/10632914624.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/nijaguxarepinusigoman.pdfIn PDF document text
    • https://people11people.gr/uploads/File/61646367020.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608328d4357c5---rufobozi.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/xikenoximikepawokajov.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941688cf8cf---69388602904.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ieukjsqdt9gv4orpcsvvvd7h1/jirujijodatinidabonep.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/61600078630.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/87553394504.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/zuwuzuwavotapisodeziku.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210610235141.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/xadig.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092965a37c86---funimegikexes.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/laposor.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161103f2e8f9f6---fobupawok.pdfIn PDF document text
    • http://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/movepomut.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516173736184207.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe15cdb2b4---84690307708.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/sumajiweposumemefozelu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021082104032434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lightspeed+zulu+3+user+manualPDF 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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 18204 bytes
SHA-256: 478f6937fc56115002a9e57d6a815a5781cc50672a02d330546015312b525f69
font_01_sfnt_off00011821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 11008 bytes
SHA-256: 146bf4cefc7952f412835d8b1706dea3b1aec5b39e83ff970720d106ba1b8510
font_02_sfnt_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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