Malicious PDF — malware analysis report

Static analysis result for SHA-256 71531584fdbd26e3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 06:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3f9a6e21af5e64dfe613de1d62a9b59 SHA-1: 6c8a0ea074a6d1ea6a639be10f8168af99ef1937 SHA-256: 71531584fdbd26e389ec914fe767acad3073e259e0ef3872aa841a8e2c23dcd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ffbd9e3b---kitefugozejaga.pdf In PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/kirokuka.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/15361086769.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/fuzidelapaverobubusow.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/wopawizonut.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/vigokipoji.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/dipemunepinafibugi.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/kananomuzule.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613075490376e---noxupofinetelopixolek.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/56813417339.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411094e3616---14004659444.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/kovivuzuwibimosas.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/86537181684.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/jigukuriwomiwemali.pdfIn PDF document text
    • http://pmke.cz/pictures/files/86773039197.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/wopeg.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/8904094386.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613567b5bd81f---88633302341.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091104163473499.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411fd918f43---99354524061.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/af2f53c2a9fdbce3e3aeec7b7e137db6/robenujulojuwarimosobe.pdfIn PDF document text
    • http://strahyi.ru/images/file/sodofow.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/komajijekuwimevuwata.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/52801871433.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/zakabezebugufarisobixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=avengers+online+freePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/dejiguwamevugigok.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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 10176 bytes
SHA-256: 96de03c028f7ba28996a480b33d10e8a76a2896dfd61a545b2282ab26ade4c37
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 17856 bytes
SHA-256: c9d5fbf29f2c8a6672a94dbfab53382ce445f215990aab0bd57311e4c5fb6264

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