Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1797be76d4017b…

MALICIOUS

PDF

81.7 KB Created: 2021-08-31 21:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffc10edd457a3a616d30dcb7b45093ad SHA-1: 093f16ca587f01ff2503a12598363b6d980eba42 SHA-256: 3e1797be76d4017b43d63426761ebf5a0e22904d7b8a7168dd72caab9d969904
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://shyjjc.com/v15/Upload/file/202172849183841.pdf In PDF document text
    • http://szm.hu/userfiles/file/batusijedamuzavijekofuk.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a6d37b84d3c1fb85ade879ae4a58c348/mulakizixegiwatujo.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/xunatiwoxozowenuxexobivol.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hbd3l3cktilpui0pgronjh8njm/mukutabomafozulipegawus.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0c886c79ec38a42447354b48b83667f8/69112217300.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/weselopimetu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/lrh730qqhkl35r4qurv891p44b/7595525939.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14c420124---venux.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcba493065---xazimidebifovibefanusibix.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf6f6337c---rofejilit.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/56254234605.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/21154515292.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/powuveki.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/jepukibezodup.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/47817938561.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/lukijenobaminuzovelirole.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vj4n4mgmpfjk22iskhjnkft88j/14058879813.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/wizamunitireba.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa1df1fb1---tiror.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/vujumumebuj.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/94332212601.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9a502ae2077ff2e052d994b488762bc/xunavasuru.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/nosamipudixokebifikasido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tubidy+mobile+downloads+mp3PDF 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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10932 bytes
SHA-256: 0cac1ebe6886141b0d52774b347b8e758b6ef896e2e07556d5bb956fa3fc6b8d
font_02_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 16764 bytes
SHA-256: b036f6c51b51cfea0a1822792d80871c995024f83ab5fbf1c7235a9f3ebc5784