Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a8dc7a116b7672…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 23:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4665e6f1120268b359c5cc1321147a7e SHA-1: 1530823040e02b6bf734c7900e110ead87346a48 SHA-256: 29a8dc7a116b7672056d7c0ecfda7418e61a96222b39f9005518505adf99bb0c
164 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 numerous external URIs, many pointing to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=keepass2android+autofill+plugin PDF link annotation
    • https://cometsecurity.in/admin/userfiles/file/22966978465.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/13503356433.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143cc196b0f3---72935163427.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/89457061758.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/20987574583.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/75886201892.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219182331261472.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210917215711.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/sozelo.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/66957203938.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/10468910411.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b017488082b6aa84e6bd4a1b9d74587c/57525364643.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/56788316875.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/64501802763.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/mozetedavizadewevor.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135621b3fc27---33703771637.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/sumafesodowiz.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/71889484939.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/3394721914.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/90798616312.pdfIn PDF document text
    • http://yanartextil.com/firma/files/vurafesawexud.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/2788056382.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xadefitevalikanad.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/sedetapagelivulani.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/ligolaguza.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/nozikimofawagafa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 10884 bytes
SHA-256: 12ba658fd597e6cb23dafb59bccdc08554945598f93565289776d67b988456b8
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 18672 bytes
SHA-256: 3ebeba9774eeec45392d9e919bcb98312f9a1d4d880421563d3e44109532df8c

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