Malicious PDF — malware analysis report

Static analysis result for SHA-256 686660d748308bf0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 08:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fba1292c5cae7df8f1f6fc3679635ea7 SHA-1: f3a590a5206d0ff04a31d8e746937a75e30b887b SHA-256: 686660d748308bf0ebe96bec65e5e05a940153001b7acb96b40c5d4735519182
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves luring users to external sites, likely for phishing or malware delivery, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=search+engine+settings+on+android PDF link annotation
    • http://ihdbd.org/upload/files/domurozub.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/popumimuwavevijiker.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/wubovedixalaluva.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/genipadoz.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/fiduxipakavusuk.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/goxaruwafatakixefokimofa.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/62255353135.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/ruvusuzibukedin.pdfIn PDF document text
    • http://gapp.fr/medias/files/85490459604.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/naxevurutivitoderetemo.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/55192199549.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/52936504925.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/88749076435.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/fibujojuriwokifimafolokis.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/50127071117.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/vumuwapo.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/bakexafojiwiwox.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/fuwanozutaxewukovenexi.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/jazuborake.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43f5ee314---72214468440.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/supexoralotixexikozojekaj.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/6095451636.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/gijigop.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422d2dd4b2---56138814591.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/6313462347.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/tasefako.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca1d406c2---87470933024.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_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 17348 bytes
SHA-256: f45e6e1fd09d790094521444bf556a6a5e0b66d69b4c5f07fefc29e8b431d8af
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 10676 bytes
SHA-256: e992f68217f6df940c29b946665b877076b08d2f270db66c0afbd41e38e31c7f
font_02_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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