Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8d0266ac9fc9a1…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 10:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b7425eec0182eb3c376c781585189ec SHA-1: 45e8ba1072d3d4b823ea201630c8bd36a60464ea SHA-256: 7a8d0266ac9fc9a12c208c70e858708db007ff5b6c6076acbc77da9cf5aaebf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The PDF structure and embedded URIs are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://allytemp.ru/uplcv?utm_term=envision+math+grade+6+textbook+answers PDF link annotation
    • http://farashimirooz.com/files/10695750128.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/majapamerivesivos.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/63372655419.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/77452873593.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/50738572039.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/20019524808.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/40512058435.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/86593378818.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/rajivedevusagopixitun.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/36640236019.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/jofolikefekavofi.pdfIn PDF document text
    • https://marigabung.com/contents//files/wofipaditedevidi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609813dd7e622---wunune.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/guwijuvizemu.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/98451013476.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09be8d75c---42499303447.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/sapowosatojap.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c4fc5bbad76dd4385da37252dee339a/jokezimofe.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/54b2baae9d15dffdb5aa4aa5ff57e4a3/riborepotatabe.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0thb6p11k393jv4rmr7e6pcr6d/budukodabegi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd9bd6413a---42303715068.pdfIn PDF document text
    • http://simonide.org/userfiles/file/75214233790.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/32188661569.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/ragowikozatojiv.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a954b7f3666---68298724934.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_off0000bf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 15184 bytes
SHA-256: c255f32da33a0d78345ee5adb5cbef8877947cc232f031415faca6c17bcbe480
font_02_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 11284 bytes
SHA-256: 2a1ca989c971a6aaa090ce77ba9ae86ca71ab99f2de25f48ea6d3294049ca678

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