Malicious PDF — malware analysis report

Static analysis result for SHA-256 77895f3b457ca521…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 23:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a4e7aa16009bb89cd08eed9dad2ff25 SHA-1: 340c38fa5e69734f245f9ca041dc86a7b8f28bf6 SHA-256: 77895f3b457ca5217d90e1c74c76836c7c127aeffbcd93ff8cfa2bfb47a0da39
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive the user into downloading or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d54100904---46908450756.pdf In PDF document text
    • http://pumarecovery.com/userfiles/files/rokupi.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/60491749897.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/76085421269.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8ds0r28mhqdlr1v71l1rb1uhv4/jorojol.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e0c39829181e9a789005f692ee07a5cf/lawixokazodozi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a778767ff42---rusozo.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/55213647276.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/piperok.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210714023326.pdfIn PDF document text
    • https://cmoretv.com/userfiles/21053834158.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/ranurajofa.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/25547966815.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210702_CCE57FD0770E0A23.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d38a2e01731af3103bef69702cdd45d/mijawubesinome.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/xetapufumabupobilezudevun.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/52882429235.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/tozovojun.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4673c15e5---72250245260.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/99uqcjm4c5fn8862l70pai7dqh/fotijezopodi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/41455782626.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/vamarezozi.pdfIn PDF document text
    • http://secretinvitation.net/images/files/66209363065.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/gikemugofusibabinob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=retirement+income+planning+worksheet+canadaPDF 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_off0000bc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2B 15540 bytes
SHA-256: 80780fdc4e1cfbada5284ad44841c8aa50c4dc199540f4e09ca44123e8cb4b63
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 11184 bytes
SHA-256: 0ba08a15c01a2951bbd7b964ad9708308b5780c2f7d6b6e2958c5f5e45147c2d

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