Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89dbac151cbdeaf…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 09:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95b09952674de58d92f7228632fda232 SHA-1: e28fbf6902c737091853a41dd1262feda33ce806 SHA-256: c89dbac151cbdeaf74a77797268956dcce4666484ed9dcb6e78b0663181714c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS upload storage, suggesting a link farm designed to obscure the ultimate destination. The presence of these links and the nature of the heuristics point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vopik.pdf In PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/19751695953.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816a9c7035f---gesebudebopenovasimiweguw.pdfIn PDF document text
    • http://ghemassagenhatban.vn/Images_upload/files/2849720696.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/49892010543.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/wosewomorigarizitesife.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53183f852---wusataruveruxugufejax.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210829030716_hpg6z6.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f6b20c05e182b6d47e32b93f7321f399/96816824575.pdfIn PDF document text
    • http://benly-carson.com/product/files/joputosupefexofubipop.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/nogifesu.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/pukedanil.pdfIn PDF document text
    • http://cortabellanews.com/userimages/59523369937.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/pedulilapavesubukipisafe.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072313415061.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/widijuxazifomiwuw.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/80102271706.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b14b35d3a6d---lujobuke.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16112178977b60---22220914765.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc94415847---66772103552.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/82071926244.pdfIn PDF document text
    • http://freeorden.com/media/file/28681425441.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/88470243035.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5boqrh70t7qlt4v13bpipvefqb/38744068716.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wenozamixilibobolunutoz.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/jotuzoliwepilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=telugu+puzzles+with+answersPDF 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_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 18084 bytes
SHA-256: e648b21403ef530d6c35a648abf4105f9f5954618fdc9f0feffed7a751a64d99
font_01_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 10620 bytes
SHA-256: 19371b8b0c84e8389b9ce10623b2cf46bfe2a24e31bb689e75a56ec06ecd4681

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