Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a08842a25917805…

MALICIOUS

PDF

98.5 KB Created: 2021-09-04 06:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d9c3fbff40006105ddc5d2a87258ce1 SHA-1: f700849efee597cb4bfb544db946a06959952b87 SHA-256: 4a08842a259178059bb79309a42a8ac654a9df23953a3e43d092e7bf856d00d9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://murtenhof.ch/userfiles/files/11793004369.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/91l177phr9i2vm3c0o13rnkhge/bavemasogejomuvut.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/wafofoxenofatu.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/pubakumagapuw.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/s112a7hags4rk2uhivei6rrhr1/361693737.pdfIn PDF document text
    • https://dineflon.com//files/288870973.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfab6e65f94---ginowulevojiza.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dd618635---84375517534.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1e8q3hpbcij37v8qs8oo75l865/75950659994.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/39649009161.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f47cbdf4---kosaxo.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/44885928301.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/13881757593.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/82857960501.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2d879def2e6708f51f494309a99a9de6/wirusevujolusezalesam.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/zilutetarotabejelizibexej.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b61110f3c6---25874858301.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/rugipexet.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/54051786436.pdfIn PDF document text
    • https://dhesient.com/media/97561182240.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/75031757166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=binary+options+strategy+pdfPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/85621903613.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_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 20648 bytes
SHA-256: 31b871134fe9c8f1cd0535393c3ca16a4a9c8bbe27462a033e44aedf977462cc
font_01_sfnt_off00014b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B97 10796 bytes
SHA-256: 91374f7d8494aefce08defb8b8cd4c41ab13464f0975b96fdf6cc4d1b3d02d7b
font_02_sfnt_off0001646d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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