Malicious PDF — malware analysis report

Static analysis result for SHA-256 1261d936c6ac2083…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 07:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be39a0831bc956120753088bda05ab60 SHA-1: c8c3102769d9016b0fd169013948cc0a6a0b2042 SHA-256: 1261d936c6ac2083018afafdec94bf60506d7570fae1e010716d218b0990a5ea
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 phishing or trojan payload. It utilizes a link farm strategy, with numerous URLs pointing to compromised websites and disposable hosting, likely to distribute further malicious content. The presence of 'utm_term' in URLs suggests an attempt to disguise the malicious intent as legitimate search traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crysiq.ru/uplcv?utm_term=design+and+analysis+of+algorithms+tutorial+pdf+download PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9cfea3576---kawituruk.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16124cfae07a0c---zobavizugeragureb.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/tulepilam.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/jaxunalatefi.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/34160939928.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97baa69e6---zowiluzar.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5f620ad14---xutabeju.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/rexazowiweduvelal.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161313c3fea574---1479323829.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d9245dbb---vonofusajog.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/puxafomanonuxakakusiroku.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/85124351782.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/54650780673.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ec850244---39631802999.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/57880897692.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084258caa690---61557321829.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/tovasotozaw.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/326489725.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/vepepafozepumenodalodol.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/59990939688.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2ksut2b0j12msu3jpkkj6npunk/25204661665.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609794898d750---87778638757.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zigofuxonajalimulag.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 11244 bytes
SHA-256: b62647e23e36d03cfd7529bac775a62b5c7a29a07586063b713e550db4a84400
font_02_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 17480 bytes
SHA-256: 4b6b2618fa10096dc2bac80c166518557620d030a8f5f09719d5ca33bdb82d0a

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