Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80bd679a3908269…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 15:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4a768d40ee3f5deeff5b0a1626aef488 SHA-1: d0f12d5810847459384aab350b82a1fe31ab5c53 SHA-256: b80bd679a39082698919209df8fc5563822d470bdf36c104d4332f2ca931beb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://queure.ru/uplcv?utm_term=lightroom+mod+full+preset+apk PDF link annotation
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/81cc1e076e214a9bde3e5715e2f291f0/bejusavipu.pdfIn PDF document text
    • http://insei.eu/userfiles/files/47604056375.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/41389809909.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/goxakutotujuzatinorori.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143007ee466a---kudazovotajamotagujam.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/lawigi.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/mizukod.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/63670443732.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/purok.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614826b754c92---72671060869.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210906223834616073mu27k283m196.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee57cedbb---29541357249.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/009b9cda2c7acf5bd406162eeae7ca14/kofuporusijutatu.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/lumike.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/f2p4q5fhp58cjde6581bum0dlf/71928161840.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/56389491849.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/rotedipavepogido.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/52052311864.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/pipiwividosezuxesabib.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/48196851685.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/75355298802.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/90598666676.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/89463995863.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 21364 bytes
SHA-256: 55ce8692bba657e731c21735e2e60a131a46e0d9ebbc5eb2ba1ddfaeefbd35ef
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 16180 bytes
SHA-256: 1d421b758c542d3021598db92ccb08b85fa73f750ac83168a6d2ad315eb4a8a7
font_04_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 10988 bytes
SHA-256: f3a3c6bc97dbb2928a18d66c70d2701cbeae2541247d512cf437082e9c208773

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