Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18a5d20886efbcf…

MALICIOUS

PDF

91.3 KB Created: 2021-10-04 21:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4ca6322640c86adf204dfe67b168a5b8 SHA-1: 6dca2fa3456fede2ba28cddcfe151fbd709bda9b SHA-256: b18a5d20886efbcf29458f8540bac2a797b7922a3df968a470551b54d01c6bea
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 websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://chcial.ru/uplcv?utm_term=8.04+civil+rights+for+all PDF link annotation
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/30163367312.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_55837BDACC36D085.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/gawunebudi.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/segovexeroruxamivebob.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/25943842443.pdfIn PDF document text
    • http://builderall.info/userfiles/file/45620298986.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/962d7a173090e687c88c44dbafd37ac4.pdfIn PDF document text
    • http://northamericaminingexpo.mininglifeonline.net/file/f89BvudI6RSIgWIT.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158e6cc08c72---53452051978.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/dazawesizuti.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/53602320021.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/kubonovilurisawararu.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/zemegutibeka.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/72282241570.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/xisepizewuvixi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/pgv9ukqrgmj89rq3tl1t8gi773/25487515022.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/puwosebo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/144eb2381d06548dd3b0135addd8a72a/92115457379.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/16022443533.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/96266388400.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3379abaf0239a64b80a2aac4547d4716/wibep.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/zoromazekajemilugexuvat.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_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 21168 bytes
SHA-256: 00cdbee005aae45be77100999c09ffebbdfb9db35ef787b44efdb901eeabceac
font_02_sfnt_off00014519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14519 10824 bytes
SHA-256: 6a6ffae962d5c7eaf4d36b0dda4e5b05b5624af50e148d354aadc919524e9077

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