Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc49a7d0765d6686…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 21:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a215e04c3a4f2bec40b0dbe1ec3fbe90 SHA-1: a64dda3c08ade85b6e22e7dfebc6fe52bc011954 SHA-256: cc49a7d0765d66862d190a7e3ab6b2447a31471d4f63ad77e6c080d61081f356
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm to disguise the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://thedreams.cz/files/22771718930.pdf In PDF document text
    • http://imosa.asia/uploads/files/202109110401325100.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/77948205863.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/29460321309.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/faposejubupo.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac1f5c33ecf497cd27c5dfb7cf4b6265/fekirilujumod.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/fidupujozedonagumib.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/91547127713.pdfIn PDF document text
    • http://falconltd.pl/cache/file/9641030667.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/82387592820.pdfIn PDF document text
    • http://pedraferro.com/files/files/waroteka.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/13248156503.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/81875740896.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353790c4488---87905947990.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/fufelewomodov.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/71678383677.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/dja0u821527iit9sogfjq6mc6j/temimo.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/rixovumimosozuwadu.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/58351390214.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/25521321102.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdba5ac10---fogutonomolijetitoboz.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/gujimujodabetaruzigef.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/xesutezasisolovego.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/40399207778.pdfIn PDF document text
    • https://digireg.si/upload/36047626973.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131e24024154---pafirijuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+camera+and+flashlight+not+workingPDF 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_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 11084 bytes
SHA-256: c1e1f3ea0dfc0ccc9e87c69bd077f22242e81876dd568af933d61ebac7af63da
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 19120 bytes
SHA-256: 109cae982f7b140c1da6768538c736c65286ac7436b96baad76b036bdaca3081

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