Malicious PDF — malware analysis report

Static analysis result for SHA-256 62053d554b377b16…

MALICIOUS

PDF

90.3 KB Created: 2021-07-21 23:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e57d7cd568ffddbec72f500fa7d56f4e SHA-1: bdbeaadb750145414602e62b99b210f8dea4907d SHA-256: 62053d554b377b1683f1f7f5e1d3e56322adb44dbf470d924d22e82ec2531bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://csc-028.com/userfiles/file/20210716194253_5l61xw.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/68e70d9d87ae1081bdb54bfad328848c/jimuweduliroxifosume.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/85148357913.pdfIn PDF document text
    • http://absigorta.com/E/file/1962395369.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/inmfudd8d8aueovap6akivi330/90477232087.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/97f0ae63b1db23b3a769bc5a996b3666/zudane.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/weletunelo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/95600450295.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/dasoparabijipagef.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/js8dah76nug8pkmn3knuu7d2gh/25149539288.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/23982847756.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dfd7217a---nakurezubu.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/xewupufodiwomimelekumeb.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/45248470145.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec34ce4da9---8835263071.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/78007002020.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e306f09c---vozajotabumuwodulejetin.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a83406a956f---zonil.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0ff64a48ff96f121524af73906586120/kogujebagot.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cf5eae60dbabeadbe09e56e905d20d2c/samijigo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c4ed01200---86017724539.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/a04b44b4dc9314ad674dd584aa6abdf7/jizobexobomabemeg.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210710_8726DDC929EE0529.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072948314946---53943477483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=stress+concentration+chartsPDF 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_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 10356 bytes
SHA-256: 9b28506900daab22fafc63e880631d3d4642dda4c0d4d161ae597d458a6570de
font_02_sfnt_off00012b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 17904 bytes
SHA-256: cc511bbe8828deb3a1cf75265df53c0052050d6f7175acc7d64756d8e8a828d9

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