Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae6d84e1d04ecda…

MALICIOUS

PDF

90.8 KB Created: 2021-08-11 13:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca24da234caf8e9bbd5920c4e1a146a9 SHA-1: 8f0952d56a8a7c2664dd54d4aaf8c735ef8c8255 SHA-256: 6ae6d84e1d04ecda40384c82ee15bed6a246d9249fbb296c86297bf021d82cb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing activities. The presence of numerous links on disposable or compromised hosting suggests a link farm designed for SEO poisoning or distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3356339418074f6c71386873e1e1fb42/26821651338.pdf In PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/35687837928.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/reburejadosojiwipusuger.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/30781342419.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c30f9b956---78550656217.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/83697591554.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/vvqdnq83ip06oacavr14oifnf3/93578061966.pdfIn PDF document text
    • http://muszempilla.com/files/file/26994474522.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ea863823d---18721664635.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/pilurufafadimupusofudafu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/101174987660ac684510d04.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/7667579751.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959ddec14c3---xerutugukumopasujup.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/bosodarokebanimefujudupo.pdfIn PDF document text
    • https://777mto.org/contents//files/74774671650.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9e2cf42a2bd294f5860975bb3529c73a/28205073738.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fee5b1cbc---23645942443.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/5049979757.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/8973160802.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xiderafinuzivedebavesuxon.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/joude39sbahiigic56qn801iu7/dijegawizevaku.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/sexusejojipigisukixuweral.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/m29a12mjalo8vdf1fdmmajjhh6/10836857330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gym+workout+program+with+picturesPDF 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_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 11100 bytes
SHA-256: add3ce21d6eda06688c17e753826f448486097964c1acb131bcace11d9c93848
font_01_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 16968 bytes
SHA-256: ee3d8e48b45d8f9da4eb8f6264e47655da46ceb0b42972252c32698aa5e88f85
font_02_sfnt_off00014308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1