Malicious PDF — malware analysis report

Static analysis result for SHA-256 71441bdf376a7749…

MALICIOUS

PDF

86.3 KB Created: 2021-07-07 03:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d68f7e9a6d3fd5ac440836a3e8dba3f6 SHA-1: 7bc9106a0beba0184bdda91a940bef0358da0469 SHA-256: 71441bdf376a77495e8fbadce5a1233d2e54d280939b010507f75c1cd8d2a1e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress upload directories, suggesting it's part of a link farm designed to host or distribute malware. No scripts were extracted, but the structure and URL findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880432899e3---33182476485.pdf In PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/rivojawabadovafosire.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/77704835399.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/sesuzevasuxuxurebamarisej.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/71896268167.pdfIn PDF document text
    • http://dgjst.com/upfile/file/51782663768.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2d074764a373a58c4dc7596ad50a3856/xerotudon.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607574a4d35b4---kiwubijifoxonidago.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a13b0317---venasanatibozewed.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160add46c14048---70710664287.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cab1bd89b38ca058b9ae4275ca1b1182/38660025201.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5b9af91b---gorupani.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///xufok.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160716aae06e66---39084290311.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/83240310603.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/mavijazozixuwoful.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c7bbe32c2b1d7e1fb174b9422a59ad6d/82005234482.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dd944fe9775c83f890bb121481a2ed74/moterugizewezix.pdfIn PDF document text
    • http://allasclub.com/campannas/file/51154444813.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160758c617e3f7---10843444037.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/sekel.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b852b940f59---11077273209.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/fc020ba25fa0aad01bb2b27a48720f81/lomipubumilirova.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/6487308821.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/67634554987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mechanical+engineering+thermodynamics+problems+and+solutions+pdfPDF 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_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 17688 bytes
SHA-256: c33dc581fdcde45f4b645c4a1885e9174690a5a39d9a368b3e815adb86961390
font_01_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 11416 bytes
SHA-256: b37d037caa94e60f74516e29e4f14489757e2270bf5143ceb8346462151318e1
font_02_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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