Malicious PDF — malware analysis report

Static analysis result for SHA-256 586c4c63a902cc0c…

MALICIOUS

PDF

72.1 KB Created: 2021-08-27 23:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd7f70b289aee9f817ab191b25ddac21 SHA-1: 46d8a81a71940ef193271d398f225cc72c7d5854 SHA-256: 586c4c63a902cc0cb4173bdbf392cecd19cafe7aad98488bd17be7a10b57be1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to manipulate search engine rankings or direct users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6aq930q4ns2t3iuib6aa1i6dg4/fomofegaw.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/kobatepadidupenedibolij.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/92719954262.pdfIn PDF document text
    • http://fitviewer.de/files/file/61248973661.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0d0ed55a---buzej.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/gepode.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/zumesafuwabezemida.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/komusowafivokebujuvi.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/65604122665.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786b288dd3c---suwaxenig.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16105e848db98b---sebakopidiradum.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607affa1640e8---xinasatafelexuweno.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/58395866141.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/30c272244f98e7617f17be1dba99261b/2007939243.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/wowifedu.pdfIn PDF document text
    • https://vzglavniki.net/data/file/xenagoperaganuja.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/notumu.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/tazome.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/matizeje.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jexojoxuko.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2d6449f76---14433965222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+grow+green+onionsPDF 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_off0000bc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 10152 bytes
SHA-256: 865c6b849d0c515f8b757aa74cd5223310d9fa645b105a5a46a5cb93deea73eb
font_01_sfnt_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 15592 bytes
SHA-256: 47ee83718a3367efa5937fdc0f94d37edbf7a812ee5690b15adf3a7b82f85f9b
font_02_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1