Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a63427992df40b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-15 16:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a847ccb9beb5a4a682ea28e2f6139544 SHA-1: 497ffec7426541673c397469f49ea478306563ce SHA-256: 26a63427992df40baf918dd3e20edfd8867411bc570ecd3984bef6d764fd090e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to execute malicious actions. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The primary goal appears to be redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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
  • 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 http://esistore.lu/userfiles/file/foxofe.pdf In PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/nasepuzalerelusirimi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343f3a90797---sevogilu.pdfIn PDF document text
    • http://emeat.ru/var/files/46038189009.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wexiwepelovixawibigu.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/6019837876.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/18090410465.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/suvubokoxofibateko.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cdmq17t9v7644mopfnn7u6vu00/40120934794.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/71526496965.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/xopivumovulariteken.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/79960704674.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c73567944abb930d4219700b94ef3038/45613603626.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/1526560041.pdfIn PDF document text
    • http://wjcopy.com/upload/files/17689660579.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/nq7dofhoo694oq3k6cne0bbujr/tifexuzepezaf.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f807e3cfc5---16385435331.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/buzuruvixakesus.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d601b0247---fowuruz.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911205121.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebfb971adc---16918078329.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/94547061736.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/joxozavivavozetebomigobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=desactivar+actualizaciones+automaticas+huaweiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 18724 bytes
SHA-256: d281834f3131c5962f1dd3698a7058abccfe83dce7f3f1f6ecaaa8a26f383609
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 10808 bytes
SHA-256: 81afda37286bd9fd2b45be66dcd71932684eb7760dc8adade7e87dd605a3e157
font_03_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 17484 bytes
SHA-256: fda4db45364f72849c3f4eccf69b1055587f7eb36981119cb776220550610def

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