Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50156b148b27cb5…

MALICIOUS

PDF

108.3 KB Created: 2021-07-08 03:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b164bf6be14a896109c10c5d8ee0d958 SHA-1: f5b3406813932e4b0c10abd2814417c8c44ee688 SHA-256: e50156b148b27cb5cb6442b5543455cbbe8c63234974b17419991337249f8d23
164 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/89a67b3478fbca9c8e6a50bcf2044567/bupuvegobudedadadabugiw.pdf In PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c03eb1194---zidorezemefapikumuwovuva.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5v722n2vjha3af3qgkpt66v4dr/19168266348.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/firevudubigatirusuwur.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a74a5762c6973d1c1706065c0badfbfe/xebenafesidagu.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210628210549998.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/bigoxisivoradipomuzi.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/30276870589.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/566e53e7eafc8e2634501a375b759f1e/xuxasowirogojaroravexaze.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/59370728257.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ad14eb272a5b419e0e48bc8091aa9a13/89488216055.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160879f3077f25---50094224587.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/ziridejipiduritapokiputa.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2a2ed55bdb0d5b0806ebf467852e2327/fotifomamixulozowonodirod.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f9120b2c---87661512062.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866d18cb9ea---50019961260.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ff4d01ac61b2fe546a5e81055e2dbf09/vupeziwop.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/fezozozipaleta.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/paxipoture.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3580276d1d---lamorufilugizilupapopebo.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/vuwagebi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d77c5d30---14747380390.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/sb90c3q4tub347t6emisbuahed/dameruvikuxisenalupogova.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/59206298434.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/em3urtqhbqn0te8ap7ocmb7o6o/25864134457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=linux+commands+for+interviewPDF 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_off00013e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15621 18960 bytes
SHA-256: bc03c40089757b0d5b713b0f86cfa406329b6dabf4b4c7fd35686eb562d774d4
font_02_sfnt_off000188eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188EB 10900 bytes
SHA-256: 9a57838624201fdbae6c67e258173a22e9936b1e3e599f20e12af1ef499403d8

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