Malicious PDF — malware analysis report

Static analysis result for SHA-256 b223a08710f167b7…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 02:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 440bcb22540d9b8351165c30e7a55e9d SHA-1: a196ec226a443f9527632b29b5e62fecc94299db SHA-256: b223a08710f167b7ec27b92a6b66fd00f8e980d28dd2170355b3abc6d2c5dd0e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is identified as a phishing lure, likely intended to trick users into clicking a link. The document body is heavily obfuscated, but heuristics indicate it's an image-only document with an action trigger, typical of phishing campaigns. Several URLs were extracted, some pointing to compromised CMS uploads, suggesting a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nepalmicrofinancesummit.org/userfiles/files/6759880326.pdf In PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/dujukuzidojowobi.pdfIn PDF document text
    • https://isgz.me/userfiles/file/53677286723.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/49628727675.pdfIn PDF document text
    • http://esteel.my/userfiles/file/66506454521.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143ae388954d---53082909451.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/89597904827.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/xumoj.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b36c89651---86169376416.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e6c76e85ad34c43ff7c125dc0e52df99/lokozuvoraxelowo.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/pimajupobulofojekola.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/kepuwalitepekulozukelu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16149e33247979---52462209471.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210916183311.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/vogakonewajuwowuwelemod.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/govukexaxubedominisi.pdfIn PDF document text
    • https://togeltop.com/contents/files/dakebufoziki.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/fununutarefetufa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/1485698153.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/31887472128.pdfIn PDF document text
    • http://unityproductions.com/upload/files/45784042448.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/44931118260.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/jefiwak.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/82340801521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=a+quiet+place+watch+online+moviesPDF 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_off0000aeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB3 10916 bytes
SHA-256: b759b8d0ff4409b3038778ac80273d05532a2db4b7927340dd85c397b2e3a6e5
font_01_sfnt_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 14496 bytes
SHA-256: 806b12a56584c6c63016fa590479f59cae95dcda9e459fd9ac9969a78207a12a
font_02_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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