Malicious PDF — malware analysis report

Static analysis result for SHA-256 5982558d4c8d9c13…

MALICIOUS

PDF

91.3 KB Created: 2021-09-01 01:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6f9343d81353065b7d7e7494c1b8953 SHA-1: be031a5c3b5d9cf359b6bd96b7805e52bd43318e SHA-256: 5982558d4c8d9c13478a9290cd6c4641c860dc38d773350c8e37d5deea865975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these indicate attempts to leverage SEO or compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://rowadalbyt.com/userfiles/files/xigisonuzeb.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1363385312609480a3a205f.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/48846396967.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/dosali.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca58bf3ec4---28259233620.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/xagedewulapeto.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da15a4962d6---naxul.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/17026416896.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a033b978df7---73417648422.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/gipixisuzitojijemunopo.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/11095982704.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/98317338894.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/77595673435.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079363e1fd1d---wukosutufus.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2kmngra99r9kjrd1lk3m6sdp7m/zisojeverapizudokux.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/bec5d4697cc910226be963d0d3836639/29679698245.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/kamokaganedoxigig.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97e5ddfa6---lagof.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/finesepipot.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/jamazilegusivuxaxoduviju.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/reledudepisanavexoti.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/52528259075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=philippine+military+academy+applicationPDF 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_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 10724 bytes
SHA-256: 8727ce8cb844e9148669ec740324da50cd0d1e48b11c82b02d4fc0a1322ea700
font_01_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 18808 bytes
SHA-256: d2921b8231d3810a17c582db8e30fc2447617ffd81a2ae87d328edda760cc95c

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