Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf11936f256f4a28…

MALICIOUS

PDF

93.4 KB Created: 2021-07-16 12:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3665ef7151900accfe6e96b793ccfdd2 SHA-1: b82101cc8849b8b22558ba87d04d31cc1eb6ff83 SHA-256: cf11936f256f4a2886a4fe343e960e81c211cb1d35a5e72c91ada011151a790f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised CMS upload storage and disposable hosting. The primary attack pattern involves luring users through these links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://geya99.com/ckfinder/userfiles/files/67995981986.pdf In PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/4241147800.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972d84817d7---sogugukalakurizavemijile.pdfIn PDF document text
    • http://17njl.com/userfiles/files/baligez.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768708e4734---xaxifibabak.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8e67bf7bd47e811c8ba78f0a728ef775/tigutadodida.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/midenagiritu.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/vorur.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6e488ccbd8d072cd898a9259a350c950/87723302635.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/rubotarojipefa.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/71ee7tlslpscnjoa1ennscre4s/97650945963.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/eaaa69bf140803fdfb7292873704f879/94894138885.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/gudevafudi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b498d17ed56---podajogeposebutavota.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/subabuj.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/28935761637.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ca42946---wudubinopaketu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160765cb7e299e---93607549925.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/83103375201.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/92793716293.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b050e47752933075ad3eceece0803476/27756204045.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/sutoxufikezetob.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/sagipu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a2c70cb4d---kepuzudemigutaro.pdfIn PDF document text
    • http://planbmedia.hufiles/wofuwezurel.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/91464825768.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1mg70om2miispjv326iqmjvd62/geroforoxuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+could+be+the+possible+ones+digit+of+the+square+root+of+9801PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 11828 bytes
SHA-256: 4aef54bce96daa6f3b3730a20c5e9b603b8a3f4c456e0bc8e189274d73519e85
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 16644 bytes
SHA-256: f84555210be1e9d0c36100ebee84599647485f6a4be82190b8f048bd4985cd58
font_02_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 16144 bytes
SHA-256: 5f2a87ed485690ae99dd00ffd3dad57dcaf6de75c4981ecbeeee12bb760f3f7c
font_03_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 2060 bytes
SHA-256: ec15c9b91f4803abbf3d77d058122fc164e2fe54e14f853c95756ec30c80e9af
font_04_sfnt_off00014e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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