Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc524807cd3b6b1…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 00:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: be0010422c5c126c958b01624280fa66 SHA-1: 57e71be91061911fe520a833b0bd03bce0e130e5 SHA-256: 9dc524807cd3b6b19d0e88986eab24ee405f6e19b6a7c558dfd6006267dcad92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress upload storage, with numerous links pointing to potentially malicious content. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608793b4934e9---44043960455.pdf In PDF document text
    • http://trans-serwis.com/userfiles/file/52310280930.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/97396250389.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2749e5c4---18937928200.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/52928944320.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc699801f1---dikikegogupeka.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01fb3039a---81023919413.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9022d2e2b---3547396620.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a612aa96f5f---jijovi.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6bff4679f---70645502892.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/bezenakujokaviru.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/66678760333.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/22641554262.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a245405a672---nudutuduxilimoxamipos.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/33baf95881e1d87fcbb9f07111edc2a1/56545346524.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/45424319187.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7d0639956---mabewujamep.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/sopilapumer.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/mexenuxovaviwenotefivifi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dm9jfrg4rf4pquc20lk1knuci9/bigugelumap.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/77769655481.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3ff1b0e45---zanesedositatufepapo.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/31395425692.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/25874602843.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9143016880704f5855092d1b5d484c8d/furub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+screen+record+on+iphone+7PDF 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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 19736 bytes
SHA-256: 0f9a9f27966faf1bcd7d730e8ed4803cd3241a795adb552ef1dd76878c658395
font_02_sfnt_off00013661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13661 10644 bytes
SHA-256: 5e58bb4dea758545af4d1e523bcef1f913e13199cd20c14c566d031d25282df6

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