Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe2752b69d59612…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 17:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb584d4c97c89e73ff0519559d471137 SHA-1: 04c0571b5fe93a0d9239878ca4121aa19e29195a SHA-256: 1fe2752b69d59612c2cd38f5709d8a2e569dc1f080c31fd5d4a16acda1f463b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://infrive.ru/uplcv?utm_term=game+king+of+fighter PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/518a4395e75e5c9af24fa85f57030c3d/mirisidizefalenudevis.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/5210417374.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/32406236481.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210912102607.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d399f3584---31072530481.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/13371643360.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/24378214953.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/vijijozopegumosemoxexer.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b13c23db---67219104892.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/wilulazoxerogonagele.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161369370d8eba---tusapotijak.pdfIn PDF document text
    • https://limsurdua.com/contents/files/vetedoruzolemopu.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/44535567446.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161356daa59961---53666034675.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/vifuxaroxusepenawolekolem.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130592b21024---16486948276.pdfIn PDF document text
    • http://heizler.hu/files/file/31283711779.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/82646493156.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jbvqas6m8f9hv60m0ot2cn5386/29807548769.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/zaforozomakuraremi.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/jupebidopazezurokifurimo.pdfIn PDF document text
    • https://vientangluc.com/upload/files/panelobam.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/20530389937.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/bojil.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/86158258258.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebbb20c54e---76151391596.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/sogijabufoxosilojiwolu.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_off0000b627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB627 14808 bytes
SHA-256: 0e7690d84882f9560305b2e44f64895a5fdbec1bee5a696550dddd3b14ea7791
font_01_sfnt_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 10576 bytes
SHA-256: c2c9b5cbfa12d5a0f3e20635fd22d9d270f499cf025ff86855f7292265cda286

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