Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3cbc890416db76…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 10:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93225381b3853397078bed0d71bb30ab SHA-1: c30427ad786e9eb33b1f69847bb1363d8f841344 SHA-256: 0b3cbc890416db76049199b9e39e1aafc78ff82b7e38f0d8dadab1121d7c90a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://julianowka.pl/ckfinder/userfiles/files/34601617551.pdf In PDF document text
    • https://alutat.com/data/file/80098803537.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/pixulifepeti.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/b5l1thidk0ficbsd6a0q8901jo/lazalanabame.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/75109441290.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a883cb6a996---jumifaxajutumibu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161286574cce0a---nezeji.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/22783122229.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0bc086eb---babatuginata.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/tirek.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e4548543b44d5b15420cffb4c7e7c72a/33819878184.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da64647f7fe---nuwabakazomebun.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/14233619402.pdfIn PDF document text
    • https://binhvi.com/upload/files/rigenikem.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5c8696dbb46f9bbb1787c5a5f9aa46ef/jemuxetugezalafuwejunu.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/dowoleg.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/33445024204.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/aab545a28171768f99d97d3fd05c868d/45429359017.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/bebelawod.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/muziwalasoluf.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/78557934163.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/56626638544.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/8820780077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fallout+76+how+to+build+a+campPDF 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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 16828 bytes
SHA-256: 681f9121dbf6370aa6a03325d4f08860604e1aeaa13777385282d91196faf607
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 10796 bytes
SHA-256: d6475c663677635b130364cee3b13f45eeedad58943305fee55e22ae9e4c4206
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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