Malicious PDF — malware analysis report

Static analysis result for SHA-256 671ffb630720af41…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 12:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4621cfa964ee2e118d5d292f2df8a86d SHA-1: 07858b116615b1c638f987e589af1f9303b1f896 SHA-256: 671ffb630720af41a0e85eb4b15535fc6aa398e6b9a307be8b19e7f8164acc0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=wpsapp+pro+apk+free+download PDF link annotation
    • http://alatasfilms.gr/ILC/img/file/12585959163.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c52b6c781---38066131511.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/gugafewaxifabawodi.pdfIn PDF document text
    • http://rhondachem.com/d/files/luxaputunaburuso.pdfIn PDF document text
    • https://dintek.eu/uploads/file/60033245403.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/noxobativazuvegaj.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910222059.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdfcb88bbb---terojumigagaj.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630766280/file/zojaxud.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/woboxojovagipabukaner.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7b245e6c7006e65610c02a61b5b86eca/lumaribezafetal.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/998d23560f6674e862d8f313e03b07a4/dedalinorikemutofotez.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/12356365510.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f8a2d0cf---nevuw.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/66820131534.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/dududewodovulitudaromo.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/98912934423.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/fudokinuriziraxizadosanes.pdfIn PDF document text
    • https://birotex.rs/images/files/13654446586.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/2335472851.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/nuvasuwuwupoguluninako.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/jixutodokurat.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_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 10472 bytes
SHA-256: 1de5f0b4669a4d2d50cdce5d53d2ccca191ee73faab18ed58eaab9e614edc6ba
font_02_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 17712 bytes
SHA-256: 4340e11cecfad6382d5e2e6e3c9a183eaf39d54b52de391c58de30a06e64bc77

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