Malicious PDF — malware analysis report

Static analysis result for SHA-256 961f17f6f80bd2f8…

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 11:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2bd48177d6c9c5eff97c9bd0ebe95903 SHA-1: 4c38140477bddc09d74cd3aa2309afb1625a840b SHA-256: 961f17f6f80bd2f8785000be24a13b0528fea62b0995b522ff2888cd6409352b
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=android+security+applications PDF link annotation
    • https://fleuriste79.fr/ckfinder/userfiles/files/rubegoxusozo.pdfIn PDF document text
    • http://cloverdiamond.com/file/4547101561.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924cb5b1d4---sepibop.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/rogesikapemelata.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161386065822f1---sexiliji.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/68158585021.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/momuvata.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/papivarag.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/gigidowelofewajipofoxe.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/konakixubexanafigupedori.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/jupolepadex.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8htcu1qavdmb15hie0r7ur3bcs/gubok.pdfIn PDF document text
    • http://novichiha.ru/pic/file/bifido.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/13268804828.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/30748075127.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141177fa50c1---wavilezuxivibanaduranedav.pdfIn PDF document text
    • http://oris-am.com/editor_up/voxanof.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/4453289550.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/10029751678.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/tufiga.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/84976398056.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/89040476723.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/83019482394.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/kuruziguxovujipumev.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f168515cf6325c9bf55e90f6450dfa30/valese.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/7097565646.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_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 10700 bytes
SHA-256: 092cf050a885a8e18308fd66dfee18cd4846355b95a3a0d7e95325ba8b38c49f
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 15880 bytes
SHA-256: 42844e460f3112737b979a9e9f461aef289c94fc8bfb21af039f242905b028fb
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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