Malicious PDF — malware analysis report

Static analysis result for SHA-256 df40862e7315110b…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 02:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d8b379763423fd48672a4033d4013888 SHA-1: 8a496d26f521075cb1c7d344cb0065166ad98ee7 SHA-256: df40862e7315110b2ade3a7876674669d646a104e6db457b02db2312844762c9
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 domains associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of multiple external URIs and link farm indicators suggests a deliberate attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=how+to+check+your+battery+health+on+android PDF link annotation
    • https://pasarantogel.com/contents/files/82534221609.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/punekoderuxosojako.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1cde5d3e1---piranekunamuwat.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/91626054311.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/pofatag.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5fneamju0bohgimhug0m3h7nkp/napavawijepagajiz.pdfIn PDF document text
    • http://trieuduong.com/images/Download/tegeruxova.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/95925366411.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143073ba4b37---46526735701.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161542561dad7a---42182499621.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/27450459176.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/nowunelubememifizojuxu.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/fenatuzi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cf05648a3768f1110f6af630290a8895/21144107659.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/84413972853.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/xijovo.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/47931955928.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/zujazodu.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/85140702955.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/24784733630.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/nareze.pdfIn PDF document text
    • http://orangerun.re/photo/files/87161554105.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/34646131629.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7be48447ae56ebe83304278578d514e6/61970904837.pdfIn PDF document text
    • http://badgerhillfarm.uk/19961888868.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_off0000b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 15648 bytes
SHA-256: 7632fb0dcc0a777be040a6f7bcd4f4bfa1ebe86f14aa136c981ccd289afdb4a9
font_01_sfnt_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 10820 bytes
SHA-256: 9260737220f325e42283f88618c6077681c0528a51065a7413682a9ad1003b16
font_02_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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