Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e096959395fc5d8…

MALICIOUS

PDF

96.6 KB Created: 2021-09-03 08:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 401c3f745ecfd95f52c533a1bcdfab28 SHA-1: 67a2e805dc7501b12d206ab75642fc7d8c14d045 SHA-256: 2e096959395fc5d888581091704a4a0d23e00461e62e40a15138ecfa8604a950
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the primary attack vector appears to be luring the user to click on these embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e1f0dcbc---42884916309.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a19c8d0eaaba279e392cd0b899e2cb5c/30976856017.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/zaladudadati.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jubewapotijaveru.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/ferefigajideverikef.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2kne1vudmphttudjr69e7edkf5/xerizijigum.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbc6d3019---pejalu.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210702200325.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/79047639196.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/13124808448.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/20676067207.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf6ee0489---tujewo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610310be8b0d9---73876889302.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59992819717.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec86523ffc---46622003043.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc16888175---25546863680.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/73256531323.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5cf98e5baf1265e315f7f392116bfd4d/zisut.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021061601115473499.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/83296847415.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/18579391973.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/damiwopumu.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/gikil.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/89757449512.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/edbjkqqaa873cme0pgkq4gnlo6/juzusazugoginubagolitaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+manual+toothbrush+2018+ukPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 11168 bytes
SHA-256: e1dcd01552c7eb0d541443ff6781788f4fdc88e9dea1a1da6f87761f68780785
font_01_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 18052 bytes
SHA-256: 83d60b17ed71ac72b23e793df77b9f0066fd8f7304c74671b52116aeb30eee78
font_02_sfnt_off00015af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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