Malicious PDF — malware analysis report

Static analysis result for SHA-256 4080d09b6a0ac33f…

MALICIOUS

PDF

123.1 KB Created: 2021-06-25 19:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9a562de66a34646f2834ae0500be7cd8 SHA-1: 4146cdb1e52fd7228931312cc48ac690b3688240 SHA-256: 4080d09b6a0ac33f86a92ab5bae4ea7fff2600e79800e5a49768f51b04d2d0c8
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress sites and potentially malicious PDFs hosted on disposable domains or raw IP addresses. The presence of embedded URLs and the nature of the heuristics suggest it's likely a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tribo.kz/userfiles/File/jinuruxawapikafizo.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8be2c646b961b9f545cab3f1da077537/22314632551.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1tghv36mhhkl19t89tqu4rr22j/potevabegelis.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/51650065412.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/17712459899.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609602604730d---nekanuboze.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/9953392617.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/95959957928.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c9bac9f3fcc667ee374e6285a58ea013/33905880687.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ed311d4c1933c63e45116afc3a73f5cc/79439627082.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16e98200c---betafajuzuderopesofid.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160990f7b7111d---51461044530.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/nexevoxel.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/jeranatibupiposedizo.pdfIn PDF document text
    • https://khanikango.in/file/vedibexexisopiwesijaz.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/195949944a0ceb41be29d2b1086463ca/bozabupovajuje.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd67560f---fozozegevomapefewogogige.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c3f9798a7---62167057621.pdfPDF link annotation
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c25171443---23497711374.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210508173001_1035959471.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdf659d61---3721442988.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rsr51kd1v40dlofk7dr2uffm84/97929281875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=holy+sonnet+10+meaningPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cfe734a41a0e17760eb7d78eb0303916/73112564392.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_off000181ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181CA 17288 bytes
SHA-256: 086cb22404aebbf2269416482ced3b98171d4c5133a02c8d69effddbb0de086a
font_01_sfnt_off0001aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEBF 10632 bytes
SHA-256: b0820ac0cfdecf4cb9430ba6e2e5de70fc1f5abb78b341ed799066c3269dd65d
font_02_sfnt_off0001c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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