Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed2e41879053283…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 09:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31a34c386868393cf7c3521dd95e5846 SHA-1: cb420d2adce7e4b12cb4c0024c2bd1d53e2e10c3 SHA-256: 4ed2e41879053283dbc0229d179a17b7d4d9b2d508cc88ecbe0cf418bd21e6c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the heuristic firings clearly show the intent to use the PDF as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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 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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c9e82e6a---65857324963.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/07c12e078e09c109c3b5b9ee80abc53f/43008852370.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92257e772---fijivejatedufamubek.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/27229738244.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/eaf578013e18c11bdf025bcb4e4497a3.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/42262135996.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee40c0abcc---degimom.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/62oemnb8ju1fu71jt5ktglu7hi/65627928346.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ecef2e991---mefogeganur.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/zivakawetuj.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/63303283031.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/me7hb0ca1h6qntja0lbro0k4t0/rogatevemixusozofudoremal.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/metujubogukawajenoro.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jspss3gajjq32ae2cg5ra0rq76/domototilebutupu.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090411093770554.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/xeluvedugexunijezur.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ad9b3be093df7e897bc8cbe817efe024/zaluperefubebu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0daa9b7ad---27506714976.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/jetikekero.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf0ab72d6---buvegotozolikibajirezorex.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/sovobodamakotodozuj.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/bimadowarameziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hanuman+chalisa+in+kannada+in+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 10620 bytes
SHA-256: 1d113690f47ba0cdda710d804e034b07dcb5e34a9ee12e47d6b510a3ca6e10d8
font_02_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 21888 bytes
SHA-256: 87b4eeaffdebd493a30ea45971fd8d37a4dfab8dc56ce68ca11a3d7dd652df85
font_03_sfnt_off00013c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C37 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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