Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cf1d0da868347f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 04:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75482f751271c347eba908fd3fe9ca21 SHA-1: 303b2882d20844aba25e82f0af71785a0cd5e2d7 SHA-256: 21cf1d0da868347fa4ecdb6c0923575313775b9a894a2f9895d839af92feff5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=hairstyle+to+make+face+look+slim PDF link annotation
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/07af88f1addb5de41ebd3b71d1045b16/58796648521.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/24688660592.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/10269679509.pdfIn PDF document text
    • http://vina2002.com/uploads/files/89458434349.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/674af27524ac7f387e8e41dfef3f9e08/belujijepomoki.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/zifurijovevineram.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/fre42lr688lmd2tsajrj7fl3e1/2719458512.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b2144b1f4c655c0d5c3600cd84f5dfbd/10508871884.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/18451685360.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/99898561629.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/wuzomewebudadelegapi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132783575a15---73111610792.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/73004015696.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/komit.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/71493469511.pdfIn PDF document text
    • http://normel.org/files/upload/file/3876689625.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/10818542539.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/popitobivefolipojamazus.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e1201c46c604b03fc1cae74b73dbd49/ferenafos.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/kuwabevezususutoj.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/zusewogevuwujukivev.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0805db15f---11612981474.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/15875568062.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/filuxixerireduzuku.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/fibodafi.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_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 10592 bytes
SHA-256: b99dbd4911c57ee786d0aa7ef9d7d5b3278194444f0e02f54324a255fc5fdc54
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 17772 bytes
SHA-256: 779cf8336a6509c1bf024a74b6ca1e8c78635652463417971bff3e114c1b5527

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