Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca57d058cd035ad…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 08:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99077ba36e8553c0ea119ddc109226d4 SHA-1: 33d8abb67e9628bdf4d3605a1a80020a76cca6eb SHA-256: 3ca57d058cd035ad5084e2b43cb263c6ce9d73d029b31d4b4884c1701b21608a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and a critical ClamAV detection. The file contains a large number of embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=reptile+and+amphibian+merit+badge+pdf PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd5f5b9268---pemejaminul.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/90677544759.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2744f9e9---4026718605.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202108231550273016.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/fakir.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f7bce3f9a---zuduwapijasoposejibeb.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc971e6784---32011204740.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/22100762304.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc2fe54c9f---94577619502.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18232ac3b1---satepuguduk.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/karutirenabiveguguda.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/nesiwifedavi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab348e0e1b8---kurupoz.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/sugutudutimitugatozi.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/16930904687.pdfIn PDF document text
    • https://agatanorek.com/files/file/34511168071.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a61a2eb9c---nonoziro.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/kalunabeti.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/15662618501.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/44f380f0a12b8aa966cd41cbd9593c66/bekadovutozufu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c577de252bfbf04bfe57116cefa7c0c8/14838556273.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/9218448754.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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 16964 bytes
SHA-256: 3cf154e8cbb196884737f013aeb7d28be64fc7dc96b3f0df4eba53d6f118f22e
font_02_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10840 bytes
SHA-256: 18f36aa3230bb756e3f5a6306f32e45a3ebba204dada301a1b8d79788ad9c0af

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