Malicious PDF — malware analysis report

Static analysis result for SHA-256 99141424e357d576…

MALICIOUS

PDF

106.5 KB Created: 2021-09-03 15:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98430daa64fb65a6383dfbf8cfda095f SHA-1: a0dc0b394097ed33b768340e7142da38e8d6ba83 SHA-256: 99141424e357d576a3ae821c6d4c9dd04a41c8216af30dd6a423ca0c77bc998d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://krisoc.ru/uplcv?utm_term=el+conductismo+john+watson+pdf PDF link annotation
    • http://mea-travel.pl/userfiles/file/zezimalubexu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7ebc57ac2f9f78b2154d00ef64ec3d11/totikanigaruse.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/22271167814.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1611ceb5372c6c---23973720887.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b5080033---ragid.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/31350848869.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/83711406838.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/filufafupesurapagej.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/buturipunivedenebuwofaf.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/eb168a593b2b71d9aff5086c17e53b78/nomoboxofasisitera.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/b06n5mcftm27k0qumjdr3ven5e/vonojigafepevo.pdfIn PDF document text
    • http://eternoohydro.com/d/files/vegumejotuvazuxu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/37629609196.pdfIn PDF document text
    • https://remini.hu/userfiles/file/nidataxenifeleduzapoto.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/95152203686.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210622194800_o71k0g.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/50677621518.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fa03810c953b90907892a640da1e1b9a/kixafijaf.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/60965541547.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/vutokegawukanufanawex.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/gisatamoramowid.pdfIn PDF document text
    • https://isosklo.cz/uploads/tozixawozewi.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/didamipozigimunisenozoti.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc22a76422---78838248877.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/78076738327.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/rigolomekedokiwopaxo.pdfIn PDF document text
    • http://sun-tes.ru/files/file/41888099206.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_off00013bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFC 18104 bytes
SHA-256: be6fc6cfa9361b40fdac3d0e0faed0a3f227bc8bcc2163f7f99c3249bfb49dbd
font_01_sfnt_off00016ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000182f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F7 10952 bytes
SHA-256: d06ebf4854bb557a09a95eff8b0fe7e1e38b7eac4d86a03efef8279695c61dde

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