Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a057fb21b6ce78…

MALICIOUS

PDF

148.2 KB Created: 2021-08-12 14:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d6832cb4554595607f325a18a5ff09c SHA-1: 3fb3cbf9f3f4cc416a82d1d0396f1ebb7bff3ef1 SHA-256: 49a057fb21b6ce785e299ffa2eda0cbff9a25d97a907a3f755144aa40dec190d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external links, many of which lead to potentially malicious sites or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://noble-program.site/js/ckfinder/userfiles/files/xutodusake.pdf In PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/sojarutunusatoge.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/74355824178.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1628519084.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/abd89v36d5b5l5bmijusknknk1/70080922651.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9799f9c4c41cdb3549d968a3d39710e3/29051451218.pdfIn PDF document text
    • https://tcremich.lu/files/files/tadilotiwuvubukofogag.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/53080719582.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/318b94bdcc88556b0ff9a82cbafe931a/1854518800.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3305ad428---sipamewosafiz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f1aed47aabe08315b114e65ceb098c60/fomomutikisa.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2c8cf7e6---fufopagelokafutikolix.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7plultjdn7dest8s1f12u5r071/34525888487.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d44a6cd1393ab8e9f1d0c989d79a6040/zovatovelivakexedalu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/71728385543.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/49826664947.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/14553091658.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/78378492334.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/82819432341.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/46908641863.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/josogebibolag.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/subevidurajusiba.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sa5s6cl5qm9si1c4a68cvh9sd2/dirimop.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe63ccdf31---giriwajezimapem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=thompson+and+thompson+genetics+in+medicine+8th+edition+pdf+free+downloadPDF 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_off0001dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAD3 18780 bytes
SHA-256: 19974b5d1b70741fd679e1f3c64931852ed6f6118e5f5a8161d6769016428654
font_01_sfnt_off00020d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D06 11324 bytes
SHA-256: aa4ee356eb3880bcbc304376d500db1353ef349f54e72cea17e72edab68ee48b
font_02_sfnt_off00022757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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