Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93ade4e70b7d5e7…

MALICIOUS

PDF

89.6 KB Created: 2021-09-13 19:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1377e77f385b88271f0f7967cb4b0aaa SHA-1: 3bbf8e287d41f8c82a6a2030547264693ffa2e38 SHA-256: b93ade4e70b7d5e709374949de5e89ce31bda1e61b18d50dd2a50df343cb6c37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting it's used to distribute or redirect to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://royal-pizza.eu/files/file/13489551519.pdf In PDF document text
    • https://lean-ds.com/upload/editor/file/15959049282.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/tiwolot.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/gerasonajevudekoxikitusar.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/vexotegaxetawojijugexojex.pdfIn PDF document text
    • http://venkateshservices.com/uploads/40671345240.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/vajewenanidibarot.pdfIn PDF document text
    • https://vientangluc.com/upload/files/41706671215.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/xededomezezadovimazojite.pdfIn PDF document text
    • http://usagimatur.com/files/others/roridupozutexuvakuvone.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/68314389643.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/vamoganejemurobosufa.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/64808689507.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/kafomakarusepiralat.pdfIn PDF document text
    • http://cudicio.it/images/file/31346143227.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3ev37t0s7s8acbknti0o1a84q0/47832081684.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/97761855098.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kagarafap.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/2405687382.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/pamavuzadukonimikikiz.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b94b3a890---forubobinibigawifijugav.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/rofegezeraroxod.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/kagurineketupujukisidow.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/lagamorigezogo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139068b3b86b---tojabonafubixis.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/bfb0ulh3d2rnsfdm06mm4bs5lj/jinogodetolodotilurulumek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=index+of+gullak+season+1PDF 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_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 10536 bytes
SHA-256: 8a7161e35bfc7813e755b6eef8d934985a8b928100fae15007a98eb9a434434a
font_01_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 19148 bytes
SHA-256: eeac69256737827baa8f821975e49c83fdd6d825c59bee2d8b2053d4f404ae00
font_02_sfnt_off000140eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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