Malicious PDF — malware analysis report

Static analysis result for SHA-256 19544a91b7e75fbb…

MALICIOUS

PDF

89.6 KB Created: 2021-08-04 04:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c5e3a253690e1f941d7338ab80274a3 SHA-1: 9a62e4e711596e904b5c18d9885169d63053dd29 SHA-256: 19544a91b7e75fbbe3bcafcb7ea6dbc96847436990b8c4dda1ea06e67c3159fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for further malicious content. The primary attack pattern involves directing users to these external links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://helder-effect.nl/userfiles/file/34034998939.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/le7pf1go9hlrjhfvcoq2gil9f2/gasatavuj.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607620938518d---11211526905.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a72uh85moje77phr9hc6dm29o6/99477315860.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/33157096433.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc2cd0480---41354297167.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/43345097311.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a71334507---tivemo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/54517770498.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/81563983528.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/vovovo.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/tason.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/reduguratigezim.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/31476449407.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/no9enjf7rb0d48kurab4hqic53/fixakagiruzono.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021625059137746.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/vebefili.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/21739712551.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/sukeboruvirozeva.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109da0de5b97---95655811725.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160881938ea680---94515119410.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62400941275.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4f66a576d4c8d0d44540fb5ebdaa2bf9/xutujezavowedemadenivofag.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/juwizivomegulitiko.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/25873336544.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/siradofededuzibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=las+48+leyes+del+poder+pdf+para+imprimirPDF 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_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 18384 bytes
SHA-256: 69732e99fa53aaf3bbd10445bef919e122fce9a03c3cbabeb2e11720cf5e8b4f
font_01_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDC 10812 bytes
SHA-256: 7388d97ed4870300ec52e41b0ad7a63d890511fdf4e066d306d10d0925aea0c4

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