Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aa298cec14edee…

MALICIOUS

PDF

113.1 KB Created: 2021-07-17 11:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e32fb59e8903c28fc8e70c32e177d90 SHA-1: d050586786fcbd4ada510097c8545dbb76eba5ec SHA-256: d4aa298cec14edeee858ed62e583b1dbfa55b78087166207429d4e51e11feb8a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely to lure users into downloading further malicious content or submitting sensitive information. The document body is unreadable, but the heuristic findings strongly suggest a malicious intent to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://p-itos.net/admin/userfile/image/file/fuxerijedebi.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d6091f1aecebac7362318d148e0fa3bc/rirenibelalubuni.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160924dff69702---22365869935.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a825aaad44bfe78e45592a689e680b5e/64879762904.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/92672001656.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/29bead2c76a754b9cb1ea05012ff8fd1/debufisadazatel.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5cb2b54ff9b94c682e387c0d9b2a1b68/xumikesuf.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ece22cfa56403dc9cd55ea9d70f8f20d/84857447738.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e5d0d6d5161a3a2e11afd51dc51857d0/78255188866.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/69873412292.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/79804753769.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd8a1243d---depil.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/eb28431a63f9d9d6d0645c76023b933c/sezaz.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/16785329562.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/meduvik.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160817a998ef5a---lipibenawisufonuzokazo.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/sekota.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/78081415500.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608ade41d7971---65081918201.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/pdkqqfb5potod0dp69ek9h9687/xovofajeguzoti.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508931838e---mimozugader.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/mojuwevima.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b123ca585fcf7b3d2ba3053d5438e0a4/68242391808.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e975d089b5954cceb11800c4d77d2298/65630742629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+36+atp+are+produced+in+aerobic+respirationPDF 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_off00014e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8C 20448 bytes
SHA-256: d3e7a7a09a9cb470f5506fa5b9d64178212cb53f8d79137dc98811ff5926bc96
font_01_sfnt_off000184bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184BD 11116 bytes
SHA-256: c15e99260a5f0ded1cea36497d62a0c5a5265ce3aeaf222a2f495d0cb1ced762
font_02_sfnt_off00019eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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