Malicious PDF — malware analysis report

Static analysis result for SHA-256 685e5404c33c74f8…

MALICIOUS

PDF

94.0 KB Created: 2021-07-17 17:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0faa0dd38819b9512df474e90b3d300 SHA-1: 2e5520dd4b87585244fd1fafa2b0d351699b5a63 SHA-256: 685e5404c33c74f8d3fbfc46e2314ab4ce23184b5ba88599fed144b7d3885964
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure itself is designed to lure users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://aerotechgroup.ru/img/outer/files/64229174771.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2083e8814d1c9693885461093021d35b/81184519027.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7d47346f80bc6cb257bf7a131c1a79b5/fozitekinipemit.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0bb2f59f1e69b40040697a2f658cc524/jimejobasosedosojun.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816e4595379---64756544254.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/fasugozukagudimesaguk.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d3a4979b---3752585118.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2aa3025e8f928df961a4e290f3482412/wokigewizowurulutuwo.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/61276295917.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0rv5lup6gg42cuhlj0n23fi7id/88976178853.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/98105930679.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/82715332376.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/46f405091810905f40791ac9290d0e90/10244781628.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/5163506601.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf1ec9b05---musugewazimiso.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/udjmhhg951o91igtrfcvp50pg1/sokatinusunufug.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85ae9af9d---30025350623.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xiriruvexasawis.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/5666f361f1b5fc4566a91a88f1675640/96895543794.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kt0i0bdsl1ec97g5sueotsv863/velovusupetigobixerop.pdfIn PDF document text
    • http://rurisnet.org/images/file/xekoxagekabofevigigek.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/zafajopenowevaj.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/sukub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=1st+municipal+corporation+in+indiaPDF 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

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_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 17120 bytes
SHA-256: 71322ecd4c7ea1bb19677d2234fe1401d7f55b9a617c9f829e55243ee9c56ba5
font_01_sfnt_off00013a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A69 10600 bytes
SHA-256: 73376ef8b1134f7c7974854ac6855176746a161d8a17b83f4594bc36a6920000
font_02_sfnt_off00015295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.