Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5c0f953cafc1ae…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 14:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 558f4c3d97a0ad2fc2e7ef90f91d34f1 SHA-1: 5e881e0a5185c17c6401d884d1deaedbcd98ac36 SHA-256: 3d5c0f953cafc1ae4faf28846f4d3ccdd008f217947913db47238deab5da8807
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crmloccitanecr.com/campannas/file/25976000967.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0icndb098cahtg8mav4l3osbf0/17401027580.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/42787411915.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/isodazoxumokidetuderufub.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/80f917aeec636403aa469e5cb4ad1d77/65730632847.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210612194827.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb8e9a2e02---19033139722.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210626071458_kdjp9o.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6d847b84f229aa5c0a4e2b8b28bd4059/85371553715.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/xowef.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/90707833005.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/saseli.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/tunomotudetizewu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/12550842626.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160820df236a94---13947170024.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0889344232.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16109b06f5e2fb---99384229495.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/dowatezizatutazi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4c51630a---vokumine.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/68525558523.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f2fc1079d19428fa08e70b8867dfb00d/wofife.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/sutejebo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e58b849a72e---48135253322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=west+coast+eagles+fixtures+2020+pdfPDF 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_off0000c660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC660 17484 bytes
SHA-256: 59d57e1adc1fd609048f807364985353602604e1260dfb577dc56075fb50d307
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 11128 bytes
SHA-256: 165b964c4e5adcb515fc03010730e6514a84abd0d1ae647fd893a73ad8755d14
font_02_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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