Malicious PDF — malware analysis report

Static analysis result for SHA-256 159bf3724c5f2aad…

MALICIOUS

PDF

99.4 KB Created: 2021-08-09 16:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a13b442ab0489552db1f59aa7b6f60e4 SHA-1: 792acccc2116b5ae047f01190e00669ae0a92acf SHA-256: 159bf3724c5f2aad53226906430fa75dfa6483ccc775cd6d28e996dd327713e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crysiq.ru/uplcv?utm_term=csgo+inventory+changer+dll PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847293dd95---12853607917.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a519694a7---55879342210.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/niraxafikewubadebaxun.pdfIn PDF document text
    • http://abpaluso.com/upload/file/2563208096.pdfIn PDF document text
    • https://togeltop.net/contents//files/vutifepunitaluz.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99727a763---kukes.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/cpblf0reogm19lpq1jqaftfhbe/xikosenidotudilajeb.pdfIn PDF document text
    • http://winso.tw/userfiles/file/nudusijalazi.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f3e79275808e1fb814527daa5216129c/38711864959.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/wawejo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab193585602---simefagam.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf99546ce0---jovuzev.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/1915f37a60c3fafa3f31304c078ad18d/ripigolarida.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0a057fada6aae82a150bee191732c629/vogagiruma.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/gudufo.pdfIn PDF document text
    • http://htwy.com/upload/file/45130827124.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/difisovo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e2c40051ba013a9d62b1e5ba41c4f9e7/bujibesuxejuvebimi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16106cfe2eb7cb---kimogeberizivodikewik.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210531_29846A602A912242.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/jofuka.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/musela.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdf58e2801---gebafuj.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/49432464717.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_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 10860 bytes
SHA-256: 7067bedf4476d713377c1d82f70df9559b0db8093ab02ad15bc43a54f398e181
font_01_sfnt_off0001375a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375A 18116 bytes
SHA-256: fbe5c49c584d7c9727c419282a1fed012d8015af5497846a9202671f332aad9c
font_02_sfnt_off000166bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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