Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3972b43392efabf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 03:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6a2bc926bcc4b37367e7a68641d26a08 SHA-1: 74b45c26ebd3b1ed75347112765c02b4207f7f12 SHA-256: c3972b43392efabf5797b65160020688c21bb0b7d85754a72c4fd3fe2b877982
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which appear to be hosted on compromised CMS uploads or disposable domains. The primary purpose seems to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://castrolmintabolt.hu/images/upload/file/baroropidoboko.pdf In PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/ebfc2281dfacfe76d4ff8edca040c96b/2182239831.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/seperanaf.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/zowufixap.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/53024872739.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091928c8899b---25291104890.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff8371188c---zizulobe.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xidukununesiwelusutam.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/pumixonorapufutubaji.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e17f19bed---tiwuzujaresikobanu.pdfIn PDF document text
    • https://noddy.nu/images/file/9159387041.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/kuvomo.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/dadofegeporaf.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/xofowaj.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/6638578024.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/dufesu.pdfIn PDF document text
    • http://kgmda.com/upload/files/18727889715.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/pewovitax.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/57270896442.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fa127bedcff81bcb764b2bbcdb143170/3607081926.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/14378106259.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/74845777310.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zugufalatoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=estrat%C3%A9gias+de+marketing+digital+e+e-commerce+pdfPDF 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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 19800 bytes
SHA-256: dcef8125993cce109c3a184de3cd8c5a1c1badc60022029b9d6752a3c7d249e8
font_01_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 11224 bytes
SHA-256: fce271e29cad053e4be8bb87c17a87dc1abdad119a0ff9be7ffebdcecd48afcf
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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