Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba31a89bf0107f0…

MALICIOUS

PDF

90.4 KB Created: 2021-08-19 07:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac380fcd79f071de47241fd6e29e4e65 SHA-1: d1a93535929de76bf98f1b79b1e592fdd42d0cc8 SHA-256: cba31a89bf0107f073d1cbd32918f2d33e21e3105a60c80f71cbf550fa886571
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites hosted on potentially compromised or disposable domains. Heuristics indicate this is a link farm, likely intended to direct users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f1eea8fba7da6ce75a8735d14c40b6aa/61476225428.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/87192339374.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/39184050476.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/96154385112.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f4bcb5ce---xazomijiguxalewozovido.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ao0r90rf2fg9j4g5bpo20pl441/15311029981.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/lutelovivewin.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa2d633e9---fabames.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/jitozen.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/66515117740.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/patesufanigotizizediminuz.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/xubupujizanumebital.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/fadefamajinobototive.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/wixasulozo.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/77677113482.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/29913145617.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/45947571484.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/364128008.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/88082216745.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ebc3c5221e91a9141e18c4b9e3362994/noruwegaxedewi.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/44411100260.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/zujanometilonobida.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/72233696337.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/65867969296.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/08477ce88033ff6386c434cc074b8d2b/kazirobezanum.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16110f0f082a35---91695910744.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/kozerisan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=divisiones+una+cifra+3+primaria+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_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 10976 bytes
SHA-256: 98bc8aa077853f9de328c2572a3f00fe9ac100dcd04299a3f319b9b36a9a687c
font_01_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 18124 bytes
SHA-256: 71c4e5b255d96fa558a3115c3bec18759d6ee8c4a0ecc3f6547caedcd7d7eb5a
font_02_sfnt_off00014175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1