Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0217e8d638c851b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 01:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd80d36cd48d55e49efd9d3e792baf39 SHA-1: 67f9a9bcd6199a2893c83d888103fa5950471415 SHA-256: e0217e8d638c851b64013dc7180bb2b81037701d68e28234ea6701cdc8669b64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with multiple URLs pointing to PDF files. The document body is heavily obfuscated, preventing a clear understanding of its specific intent beyond the link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://hitecds.com/userfiles/file/62042732128.pdf In PDF document text
    • https://jensbrode.de/files/file/lebovosesar.pdfIn PDF document text
    • http://etre-belle.su/images/file/85240474570.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/fawotogugigixemesu.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/43613285068.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210619_278E7F50FFDEDA14.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/tajulivitidotomup.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/terevubilow.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3029025ef291c1f141b9a999bced4ac6/87349001206.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292596f2542---wojumirexikolujok.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/gokupuvolusuruzadesovigi.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/23851075254.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/zirusutorotifumunizivagoz.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/vidovabuwekasogidukavok.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bdd084ab5---wogovapijitena.pdfIn PDF document text
    • http://teplospectr.ru/images/files/rifoxirapewofudufoniwet.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/10672135282.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/af5a6e741cc0239e0d8a8eec542df693/rezibelelik.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/24582100966.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6b9821f2ae073d6557592268248ca258/55914798071.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497e706252---51957560749.pdfIn PDF document text
    • http://szwygs.com/upload/didadamusupig.pdfIn PDF document text
    • http://ubest.ru/images/file/19058920100.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/628c7eb8dd6aaa855fba6bbdb0b013b5/fitan.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/bilapekonifegolosi.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/dk24s8h39s1lbp8mkdkrttv3b0/55923978919.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/takeputosagutuledajive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=physics+formulas+for+class+10+cbse+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_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 20136 bytes
SHA-256: 5e3b53200ffdb72c6c3eb9bc6fa4c468cb7133b9419e81888a74283bb27ab8e6
font_01_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 11212 bytes
SHA-256: 4d8d011fff62250614a4e971510214d818b0da9e5367eee62e902ffad832e2b5
font_02_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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