Malicious PDF — malware analysis report

Static analysis result for SHA-256 376b1c5875e9878c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 21:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2fae6c1641b15092ebd771e38d431003 SHA-1: 3226131aaebd496bf7d6c77fafa66d2e450678de SHA-256: 376b1c5875e9878c00dc33147e7fe79dfdb3bcd733aa3d4c64870ca97564678b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hosungtour.net/FileData/ckfinder/files/20210703_A350E6CB3A092FB6.pdf In PDF document text
    • https://nomortiga.com/contents//files/74295254867.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/74502284316.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/18045749773.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3ead3cea---77366986573.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/76978521583.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/lafoxiza.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210906005916.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c920fba2fa---pizazufadumoz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac209db41---rotekavumejafowufodebeda.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/tududamutibolus.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/47264860145.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/94732759200.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/286c3461a5ee288059b8e8a272860ccd/bogipukesovar.pdfIn PDF document text
    • http://falerisztika.hu/tmp/50828186103.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a72320fea376a0620b923f649db481cc/dafazeke.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978f74c9bc3---jeguweliwefizamozaf.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/17823937799.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/topafikixolanudij.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/17683259675.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/xesusuvirad.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9599af2788---zojike.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/sukevususimipofegiverelem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=embedded+rtos+interview+questions+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fa585b87---48829839904.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_off0000c878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 10972 bytes
SHA-256: dc13413d481f4380e9982550a1c573550545779b90d85c909bfcc1d52f5627f0
font_01_sfnt_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 16420 bytes
SHA-256: 535482e7983eec077d63b9f954ce209c3314e39008a0c833b81bcef66291fbe7
font_02_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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