Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bce720ac5fc469…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 23:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1afa67e0ecf7f8a7c34414c367ca5471 SHA-1: 19623125a28e9a7eef19f3764231d86a7ac9fbee SHA-256: 28bce720ac5fc469134c75af7358759c2c34094946564c1a2b3fb642c75e7a8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to potentially harmful sites.

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 https://pistant.ru/uplcv?utm_term=using+apostrophes+worksheet+pdf PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/88ecc7e8334042cb51689a1fe5ae29b5/17349849017.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/30105100891.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/96181239137.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/80401229559.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606da72adf9e0---latatonagabudivogubik.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa97502cb7---fewojekuxidamoxujanofak.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19051b3c50---91981478477.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/risepasokezepojo.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/41396351797.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/gaxegemukixota.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e0381c43d---zatasinozoginowan.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/memivutevodajikavo.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/sikadabew.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/isr01phann2iah7l8o3s7qb61g/85481598106.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pibavuditadilawumezuguk.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/rurekewi.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/29407811312.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da8a53576ba---45236212751.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b43067a8e---6560600137.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/cd1c82948666dae111e57165c2f21218/pijumeropuligujuguvoxu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bdfa88e95eafe1f10c14086ca135e2c/pulipovubigabate.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/narojuxojurerafobi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/eu3si385pj0cjidpjgje75oeq3/71922206158.pdfIn PDF document text
    • http://mlight.cz/archiv/file/nibasozodu.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5471fc15---zosugadojuziki.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/niroti.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_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 18688 bytes
SHA-256: 23b178194c83a72582249f6600beccaf7fad61035435cb82de4cc74e5680e3de
font_01_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 10916 bytes
SHA-256: ede4a955fd3d8d691e731a8b3db488110b4965b245a907f105371350fae35028
font_02_sfnt_off00012d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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