Malicious PDF — malware analysis report

Static analysis result for SHA-256 c296c89db0ecf31a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 11:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfb4ca708be1edf4bbdac142a64793c1 SHA-1: 1ebc002faae193b7efbc7ad61deb191727ffb00a SHA-256: c296c89db0ecf31ae934b10d8c4b97153f29240d6c8a2e16be6634c04a1593bb
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of a link farm pointing to multiple external URLs, some hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier clean score 0.2303

Heuristics 6

  • 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
  • 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://planao.com/ckfinder/userfiles/files/jefemuf.pdf In PDF document text
    • http://king-ber.com/UploadFiles/file/20210909222733154.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/xuxazedapedaxa.pdfIn PDF document text
    • https://basisnomor.com/contents/files/58824999072.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091011460073499.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/76760833302.pdfIn PDF document text
    • http://alvitraders.com/files/bajivax.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/fufijomelemoras.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b2ae109a31a8eda0e72261b38eabeff4/fozakoxilukusowakoxexu.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/6176492136.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139898228fc3---95693098973.pdfIn PDF document text
    • http://ore-processing.ru/d/files/76182086284.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xodaparufoweteso.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/47194488379.pdfIn PDF document text
    • http://goldmustang.com/files/files/63802319436.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/45162085725.pdfIn PDF document text
    • https://netlandschool.cl/files/89197492102.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/85277100810.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/c4vlmk1ph04aj5dtfahviusepo/tuzikuvitujenasosadugodi.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/zuvuguxikonogimanatinu.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/81970123094.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/nixewukibotoferukujejab.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kefefopabokusulixujimepi.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210911080325.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92689603515.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t4gdti0aq0id7flbodo80rfcnf/14819268948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=use+android+phone+as+chromecastPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 10740 bytes
SHA-256: e0e6578f2b7f042b951eaa44802b8f110dbc711f4d4ae5adab7b2b3a011ca741