Malicious PDF — malware analysis report

Static analysis result for SHA-256 7484334e4dd2621a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 10:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b63cf5e620d0ab3e6de3aa04d219a09d SHA-1: 838f181ada46e1c8d8bfcec4449e47cee8a3bad5 SHA-256: 7484334e4dd2621aab7b33bba5b9f6a23ea7b11f6764f028286273eb297fc2d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8b7258f9---37712406065.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/63972600587.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131af5da390f---87340497961.pdf
    • https://turkeyinsurance.info/images/file/76235532772.pdf
    • http://mcutech.net/upload/2021/09/file/16311578341364312997.pdf
    • http://drcleancenter.com/uploads/files/202109011517233145.pdf
    • http://machulski.com/public/file/kamuxupekemelenoj.pdf
    • http://brenno-tojestto.pl/userfiles/file/94353536222.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bd44c8da9f6e5aa5a1a8105da5679f1b/13822881984.pdf
    • https://dienlanhhonganh.com/images/pic/file/15122716917.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/bowapum.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914140157858375.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-04-15-32-36-33.pdf
    • https://bmw-zona.ru/uploads/file/vuvoniboxazodoxadezera.pdf
    • https://pasifikendustriyel.com/userfiles/file/88653422806.pdf
    • http://highgaincomposites.com/img/file/2021911222439.pdf
    • https://maintogelonline2.org/contents/files/39241717566.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=among+us+download+for+free+for+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c991.bin
00dc4422b174dd9cada3a25cf9300261b0a7575c0f12267c052e6d88b2861cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 10940 bytes
font_01_sfnt_off0000e2cf.bin
c45004600dca896b429824fcdb315243297511b7781947b639e9dc8825f10043		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 17016 bytes
font_02_sfnt_off00010ead.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 16792 bytes

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