Malicious PDF — malware analysis report

Static analysis result for SHA-256 74425700287a7376…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 01:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8897cf435ffa63ebbd0eed369ef2f37c SHA-1: 07dc58033499b0ca57a4beb0180334929931a417 SHA-256: 74425700287a737630fd2119f55570895bc30c61a2f71e065ed9e41ff2bff938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. The presence of these links suggests the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=watch+avatar+the+last+airbender+season+1+online+free PDF link annotation
    • http://yogo110.com/userfiles/file/9002361976.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109171437542180.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/16706874473.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/60029106743.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912164257914386.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/59039295243.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/83986141939.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/42978934735.pdfIn PDF document text
    • http://vhshf.de/File/kebarezijalujukexudo.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210908111607.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4c4d7fc9---83019096028.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/jefelemap.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/29075126396.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614205552cc19---80247783308.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/59974337824.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/ruxigulobufujab.pdfIn PDF document text
    • http://orlickachata.cz/files/files/kegalowujiwejokudajasuke.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/92214818247.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/psr82obr3vh3gggrun198hml2b/negadojin.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/15351270606.pdfIn PDF document text
    • http://ebus.cn/up_file/file/rabivejumideto.pdfIn PDF document text
    • https://norservis.cz/files/files/murikogufipimukajagexet.pdfIn PDF document text
    • http://innersolutions-uk.com/file/3267568269.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8143e311e7cd7f2406898925db942cdc/podivafaxasirulas.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/jafavukexexe.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/lomosokesuxapabupefuta.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_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 10824 bytes
SHA-256: d0961b73ef76fdc32948019c2d6dcaf305f6a55efe86b5df4743c3047e349826
font_01_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 17560 bytes
SHA-256: 831c37ccd9bb1ed2a8bd91abd74384d63d9bd7e32cf7a4d8b883e58f472e5eec
font_02_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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