Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4795c0369ef653d…

MALICIOUS

PDF

90.5 KB Created: 2021-07-13 14:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f635be237652437fc7e276cb0741b8fa SHA-1: edb3f6c976b3c0cf1198a4e64bad00a322a78675 SHA-256: e4795c0369ef653d1184ee33f586d8aedd8267a354b731da572fc43325ac4723
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://stalmont.eu/userfiles/file/29925710964.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608549d7403d9---3665448222.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94798693510.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/21204323926.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fe9nc6cb6ht4esu6qsrqgsbk2e/towobedufiredofo.pdfIn PDF document text
    • http://patroha.hu/file/garesuzozirosimazaxajuwez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded431cd071---13254695074.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c96a42dd---jajaniwosunasaviteveka.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/m668ar8hdmjgv0ktjm9uv3vvo2/gezurubivogafiwomone.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092edda92247---mujiboxemaxewexeximamodop.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/suzuxuwabis.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/630b4bb516771614349a2c05d582bf2d/35521611521.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/11800369778.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a07ab2548---41559901567.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/12026067754.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/xogeduwipuvoj.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bacda51041410242a9db2c1512ef7b9/57837222018.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f7a53f76cdbd2d095b41026aa1f897bb/69628150135.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/73729624179.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/76008346750.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25d326f3f0a120d57e71a1349f5599eb/zenas.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tukinobeniv.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/10bc27ad48b2b4395a8bf56669f6f1bc/73367853843.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/69542848820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=small+batch+deviled+eggsPDF 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_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 18352 bytes
SHA-256: 87ba11d8c14a32f4119dff3d4b9ab2d8503b8a87f3c48b1b4ec8332adf98997e
font_01_sfnt_off00012c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C21 10776 bytes
SHA-256: 7eba348f1bfa4b9b745b61630c10fada8112d598020d104623852e96ea9ee937
font_02_sfnt_off000144c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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