Malicious PDF — malware analysis report

Static analysis result for SHA-256 8158c0c55a81fc2b…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 17:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d92cbd0c46a732aa1db2d261ebbb5f06 SHA-1: 8271e3cf7970c6be139d88190fcbe9ef6e29b0f2 SHA-256: 8158c0c55a81fc2bf7bedda23927ebb81518a82f0d5320d1a332551c646f3842
132 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. 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 clean score 0.2255

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.
  • 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
  • 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://weyergans-hcc.lv/userfiles/file/76150653598.pdf In PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/janoliwugavujepiloridez.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/nafane.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/91970593510.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/34896151fc38b84696c5b846b8527753/nusofepeluxevefimiremebe.pdfIn PDF document text
    • http://melvin.cz/data/79472655253.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/79579795262.pdfIn PDF document text
    • http://epmachine.ru/d/files/83888334731.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/murogivetupowakupewivojax.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/36334706503.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/gulegonaleweni.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16693317150.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/13894266350.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210911112206.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd3c98f21---96714768182.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/67976832827.pdfIn PDF document text
    • https://telorgabus.com/contents/files/bitiweletowa.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/kivowemuza.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/10677047278.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/35684271767.pdfIn PDF document text
    • http://lovesenergy.com/file/86304576253.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/25449171648.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/36d1f82509598424108e7dfc2df51b62/komita.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zegibovolubokugokij.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/97780501897.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/34339880110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=precalculus+worksheets+with+answers+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 16776 bytes
SHA-256: 15454f9f5a2295dc7048a010a9b798d1b1d6281636ba7788ef2600015ae5ef9f

Open this report in the interactive analyzer, or submit your own file for analysis.