Malicious PDF — malware analysis report

Static analysis result for SHA-256 4954d498d900227a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 01:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42e3d14d9a42335ffd6e67bec55bd49c SHA-1: 6405bc56d420e1b60f0c90fcc61e3d9a7eb466c9 SHA-256: 4954d498d900227ace76c9c6d9a0ac9fc2100466f5fd54e2a2ab8ca8dcbe0341
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF document body was heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a24ac16233---bupazelifez.pdf In PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/40838888037.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc188873e---12582812944.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/lageziz.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/51204777739.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab1a21d4b1---tadusifadobapejetutem.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ae273765---bibajadabarijujijukora.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/28848398376.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/soridepukalesozapusufet.pdfIn PDF document text
    • http://benly-carson.com/product/files/89673065519.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_170559.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/rejiwuvapew.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfd3e2df6---bebedodufibi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc82982e39---moxedozideposere.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/radufexutof.pdfIn PDF document text
    • http://zuche0551.com/upload/file/sujalurifuzuvokejajuto.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/paxonuvajinas.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/jazawogu.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/28201475922.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111253fb8091---89829404586.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b842fad412---zajobusodijenokezutazad.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/88764804684.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/sibunase.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/zazokemuga.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/nozewuzamavofurivigune.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ad72633bc---86125318866.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/687de306e04526bdffddeda904f93233/woditaxanemanusavoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nda+question+paper+download+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_off0000ba95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 10800 bytes
SHA-256: 88633e3caeae14b5869a74ac94b71ef08daf23fc05d85c69c9329e497cdf9b1f
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 15892 bytes
SHA-256: fd1562b04bae9d7f5dca8930f0d6d26a29d30080e4a4b983cbb9af59cb4da1c1
font_02_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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