Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d1d7fdb441c71d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 23:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a0176a5ea7fd33096cc2d4feff9fc04 SHA-1: 25c9bc12bc760d57fe3ffc1a59e049852f1c9ae1 SHA-256: c1d1d7fdb441c71d4581cfb6c1f013741c9d426a49983260a173dae4b3e77185
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, indicating a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cafesezony.ru/fck_editor_files/files/luriwomikolitogalefo.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613005f572b93---dinekegegokixetu.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/90627757721.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/8g4b3t47le9nat70pvrm27vlgo/25997195710.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/91449031651.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/86864992941.pdfIn PDF document text
    • http://synfarm.com/upload/files/22101420356.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161313135f0c41---ronijapexolesa.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/zufuvodirozovafunilukaku.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/r4lv9qit5j6plmllofj1kia2r5/11305451037.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ettn79fqm589qitf1deults16v/zaxud.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/38802050982.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/wusegem.pdfIn PDF document text
    • http://mcutech.net/files/74107827842.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/vexibududuzabozovul.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/26686311621.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/xarobeketeleviremutitoba.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/40161870130.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/21337242141.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/mimivuzawovuvazidiwukuf.pdfIn PDF document text
    • http://knipia.com/userfiles/file/86964125523.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/44903734158.pdfIn PDF document text
    • http://koutingchina.com/upload/files/xovugojifakumamulakewa.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/60829847505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=way2news+app+download+apkPDF 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_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 17276 bytes
SHA-256: de43a1ac38513b1f3600ac8ee9bb682586bbc6d5f572e177bb4b01a87a6550f5
font_01_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 10500 bytes
SHA-256: 38326c08b0c87650cece03e719f79d855e675a3834315d1ed149aa40ad9dd5a1

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