Malicious PDF — malware analysis report

Static analysis result for SHA-256 073da1526be148d3…

MALICIOUS

PDF

108.2 KB Created: 2021-07-28 09:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f63c7f2b23cd0ba15626343609edeedd SHA-1: e75932d9341185082f4a3f1d9039a34bb03e6ae9 SHA-256: 073da1526be148d3401ac1adf90b57cd7146fc91c2684a33118097d98288a453
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 compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://blessingsngo.in/userfiles/files/guzubogulekejemuk.pdf In PDF document text
    • https://fivetc.vn/uploads/files/funoxetowojumunaredo.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/lumupeximogikezutekofa.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/wamiwewiwabisile.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/puxoxosotibo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/65982468204.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/81718548452.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/44548951924.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/32b656c12c801045fe518f5057bea542/1950450947.pdfIn PDF document text
    • https://inncredel.com/uploads/pegatetebiximirefepe.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092feefb7af4---nafusesoxugejejufuk.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/rumipaxobosifarazatow.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fcab00d462c---28995473558.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/givitirukanuwejekegibipi.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zelabufotav.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081cc9490537---dunamosabejotaf.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/krhp3gdo9g201lqcrcvrkbdmtb/wiludidesidepomakulasi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2abafeeb84c3816916380416382649f6/22873635622.pdfIn PDF document text
    • https://amblamy.ee/upload/file/wenujotobowasefoxoma.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/49073189629.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/61948739409.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/bujirekelotulutodurojosof.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f7df3463---ziwimekutekasuzelox.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e47d1d389957639d520953537f20e358/1421438620.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/40927677362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=teste+grila+limba+engleza+academia+de+politie+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://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_off0001431c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B33 11128 bytes
SHA-256: 4515c07a51aa3d9deca54ddd1b1579b03617abf9ba138328e39814a76f88be56
font_02_sfnt_off000174c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C7 18640 bytes
SHA-256: 6173e0bd745ff37ea13a47ac6fe57dfa0acbdfd29ee7199f45db61c32b7e97e1

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