Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c41865ea693139…

MALICIOUS

PDF

82.0 KB Created: 2021-10-26 03:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c63d64d8c31a5379892aec99e84c084d SHA-1: 7b98be06742819825ca3270041467d709b8537b6 SHA-256: a6c41865ea693139598f3edf518c1fb6112ac57db86df22c2a7e82e21aa8c1a2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sxnqx.org/upload/file/Fl202109221908167488.pdf In PDF document text
    • http://tucholainfo.pl/userfiles/file/84411875905.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7a29429168368c2690d3877035252984/34397765801.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/45727236541.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/vusumixawuriwini.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/75101621665.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/nowibalesidazedig.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/53821805040.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ed2f2f9939da6ed574fcb0a8c70b732d/43629757674.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/34396190174.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/dutipufuvesefederimomu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a59d794b76e91d37de24bc51cdb8f341/lujosomigarop.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/7733779000.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/rupoloriza.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091404215770554.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/50351933546.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c16908fd3---delewaleguru.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/modajitalukadomoj.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161565185e62e9---57724472710.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/susejukusesovog.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/raregewijulerefar.pdfIn PDF document text
    • http://benly-carson.com/product/files/21541338598.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/74910441121.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16151071f7e3ea---zijevunaruzobu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=triangle+in+a+triangle+symbol+meaningPDF 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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 10668 bytes
SHA-256: f60c84d4ef4c9db6a28aebf08aaf2f8124ca79f7ae3a421fdc843b8c4cdd72d9
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 17080 bytes
SHA-256: f03852d4179a95174122136df0319442e8fdfbde284b2b31bc262ec398154dc1
font_02_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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