Malicious PDF — malware analysis report

Static analysis result for SHA-256 0757bfba22b3b9d8…

MALICIOUS

PDF

93.5 KB Created: 2021-08-09 00:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fa572b4faa522344bca4ef5d9eb29a7 SHA-1: e1275bd188c8dce64618c5da8b695cee89cf9f5e SHA-256: 0757bfba22b3b9d8ec4e581ca8118f336c7f3e9724abfe043f97226161b57e8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://alituncer.com/userfiles/file/66268851258.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/744102bae83401dd476484ce11f44ecd/24971860779.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef93583a58---gatupurutewowof.pdfIn PDF document text
    • http://yilip.net/userData/board/file/92446189036.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9602b304079386bedcd998ce7fac8803/surafenitipidum.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079df99da887---wumotonona.pdfIn PDF document text
    • http://rideco.hu/upload/file/ziboduturuwaf.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf67e03b5c9---buduveditev.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/caa6c23912da0cc5480eb46f3f7a9950/75681696093.pdfIn PDF document text
    • http://jarosi.hu/files/file/kunidojunarofofikukoz.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4571ae719da82fb1f5d2c79134418f1a/8011806997.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/nikijepijevodidegepe.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jufiwanovaxukexinazu.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/31670358220.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/fuvekixagifuwan.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ca2dfb5a---78021207302.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091492340bf4---73542116853.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6fc915dd---11102472994.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kbt4e74shf7p51r8jhr9s26c44/busexegijuwo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94c5005c3---pegarosoxexetezojav.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/daarprr9l2cj8vr1offft6an61/85199830818.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/wakitamif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+scariest+vr+gamePDF 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_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 16948 bytes
SHA-256: c9c407d2935656bfb17076d34e28a3d507736090f9c31e973cddb3961a1b97c3
font_01_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAB 10468 bytes
SHA-256: c4fb4a2f05340a42973b5a35cf9b338c006728d9e1116bcb3deafa101e226490

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