Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60afaa48ae1d725…

MALICIOUS

PDF

88.5 KB Created: 2021-09-19 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7306c4e8fed9f6d74c832476f0c476e4 SHA-1: 392b2ed3c03eb5ce3203f033788b60d5de7ba989 SHA-256: a60afaa48ae1d725a655c0a4dc19c6328ca17849714a0e2b8892ac21f9cc9a21
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests an attempt to leverage search engine optimization for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crewmak.ru/uplcv?utm_term=crop+pictures+on+android PDF link annotation
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/dozewegix.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/wudutikutuxevejumupulenin.pdfIn PDF document text
    • https://birotex.rs/images/files/38416223652.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/vurivosixifiwupef.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16317838562468.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/zadodulob.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/rebuz.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/witalabewipokapofu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342ce0501cc---83326068991.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/78466399562.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/sabubojajil.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109101533038409.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/famoxijanululamo.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/74334603239.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371eb8e4d16---51096576359.pdfIn PDF document text
    • http://sakem.org/userfiles/files/51369830041.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rks1jqbrfn6qtrnhkarl6k25aj/xejubominugepunoliluvama.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0ed63f3d---xazor.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/taxunuwekapo.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/guwupurefifibu.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zumuvelawikadorakekevug.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b53b9b59b---wepapinorufenoka.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/63913172866.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/kajekofuxovugibomaxew.pdfIn PDF document text
    • 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_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 18804 bytes
SHA-256: 44d952c070eb6b4f6f4d664901f07d2c144817da00b795d145d4ee7c6b0f1f94
font_01_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEF 10592 bytes
SHA-256: 241aaf6b783ed3b6b715bcadbf14d3bdb721cfd68fdb50c0e06940fe39b1b3b2

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