Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05481114e671d47…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 20:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16357ebac609d67e00a5e2998eda641a SHA-1: 4df456432f2a38f199d4f5124cc1d057ce1c1ffd SHA-256: d05481114e671d47a650d6ac26ebf2a681a668bf01ed44e84133cc4e98c9aff5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The presence of multiple external URIs and a link farm structure strongly suggests an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914aef57ea2---46914006716.pdf In PDF document text
    • http://eis-pieschel.de/UserFiles/File/30954666912.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/52740815155.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/vabejamopefudukag.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a986c84e6dd---bapomekimodefabovevaj.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/xozesufokol.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/725251f81710fec0b74d8023031d0a84/vilujegigodenobep.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/6baa1c8dbc501819f89d934d854cc60e/begenajajotafuzozi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/nefudidisesez.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919b72b1c8d---pejidala.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/gepapipuzomatowikadin.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/53835118252.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/famikogenelulozapafixi.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f2d4c731---piveparomawekofiramufag.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l9jlpmqub2p0b0s0lm4tefagoa/budimoliwoxififa.pdfIn PDF document text
    • https://btegypt.com/file/jemedusonabugoxiwokibuziz.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a5801ea5de118c582ed7ea0315cbf0fe/14237193522.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/35848682685.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/7539682591.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/clfsnd5lesvrpf642tb6r1f6s4/dazeliveletoxifak.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/golijogenilejupuxap.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/20291509646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=assainissement+definition+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_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 10496 bytes
SHA-256: 12186054253508253ce082f7dd6c2de414c675856b76bb3ce079679fd4ecf211
font_02_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 18692 bytes
SHA-256: 9f468e4cd6c83ffe201c8b36d12a14cf357318698654bd060f7cb3608b84f598

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