Malicious PDF — malware analysis report

Static analysis result for SHA-256 7907f1bbcb719d55…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 18:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fee319a6c0eeaff462368c402f1c49e SHA-1: c3eb554ead76d28c532ad713933a10a1c8e5722b SHA-256: 7907f1bbcb719d55e181d39b7e6f3822228ce12853987d4299fe92f15140c2a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing lure or malware distribution vector. The presence of numerous external URIs, many pointing to compromised CMS upload directories, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit users by directing them to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=jalalain+bushra+pdf PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161061e50a63a0---85538130641.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210731_45D8CB5BDB7900B6.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1808f53d---28039834145.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/54643009893.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/xotifazunaxaminewabav.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f39b40c7300d4b073e72d7bb63abaa2f/nawurotabegid.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/2275409404.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/utv99s7s7f03gdeemf99207t07/46886192576.pdfIn PDF document text
    • https://geloracinta.com/contents/files/deziwige.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/4584815164.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e7a919075---63688579863.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/vaxapofonosegifan.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127a0a77691d---ruxexazakutuvolalikobowis.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/defusosazo.pdfIn PDF document text
    • http://tencanpowder.com/d/files/defizaseziwemib.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/66552779423.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/pifume.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/roxugome.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b12f288f---vedusoxuzugutomevok.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8bc201a7---68388545031.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612d05031814b---679100746.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d1f437d74db01c2038e7538fcc9657e1/26965455813.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7adcef5a964c570870188ca7dd6dd1a2/66245842587.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_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 10476 bytes
SHA-256: ba0fcfc53b60c5a5ef485d65f3a6601ff5bcab11478dae7f72bc324e476db36a
font_01_sfnt_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 18904 bytes
SHA-256: 1440ed458b0242303aa643ff4caefaf346ceebe149f20309514aefc8eb6960d0
font_02_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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