Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1641fdf80d6db5…

MALICIOUS

PDF

94.5 KB Created: 2021-09-21 09:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bb33e43cebadbab3ff2e7203a4bbfb64 SHA-1: 794667af6f48deb2a05751da9db8f9e21f510d5d SHA-256: 6e1641fdf80d6db59819943c305f8ae80f6da172665fbc03aadbb66be39e1b96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also contains numerous external URIs, including links to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=putlocker+in+the+heights PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e7d48d31---xomuje.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/99574949085.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/56861693615.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/mulekoxifogiketojikozokiw.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904065516.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/milup.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b801872033cc447dd648b4c0071e0d8b/30627790837.pdfIn PDF document text
    • http://enricobarraco.com/files/42017075038.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/toxelonapixopuxunuseni.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/24866482590.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac2f2731f---42135572865.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/17685559717.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/71120050384.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/didedos.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631316066_1.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/busovifekeva.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/modatopafixejekesep.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/dijofoluxananofavovadize.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/99354374338.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/12997304925.pdfIn PDF document text
    • http://webbuilders.com/files/file/namededekuned.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c98db7cd---96218654152.pdfIn PDF document text
    • http://domuran.pl/files/file/nozovibegajuxizap.pdfIn PDF document text
    • https://sitarasign.ir/data/file/28462499501.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_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 10540 bytes
SHA-256: 85ac1b1e452e8faa1c439969bb4b1d9cf615b6e491193183c86af05ab476dcd0
font_02_sfnt_off00013947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13947 19444 bytes
SHA-256: 535ae79009d339b5c341a421fb7cf658bb0e1ac6a10fb6eb5747ba4b6bff6dee

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