Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19dcb62df0847ee…

MALICIOUS

PDF

85.7 KB Created: 2021-07-22 20:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9061f73c308b158f9c5a1826b7daeffd SHA-1: 81a4a1035f2cd6ea9c0fae568da12437a5026f02 SHA-256: b19dcb62df0847eed16ea85d8958b1ef0e42f42c869402a83bb60eb3866fc216
164 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706127a679c---93871391336.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/71be0aba8d4315b74a2532aeed9ce80e/2064452924.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/faxurexesan.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/97423541515.pdfIn PDF document text
    • http://jaatkinson.com/userimages/99803188453.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/89661865988.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad496d77c7---9603769266.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ba4fe0a2b---78841924641.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364e04c339---migegoropabajofalunifiv.pdfIn PDF document text
    • http://letdentalab.com/img/files/3098435380.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079588eca4c6---13316030445.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/5093829686.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b0419d81870bf51ca05324aefc8b74b8/nipatusunalixegow.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cbeb85ea064466febf31916abc8bb45/67703910691.pdfIn PDF document text
    • https://imperfettoristorantino.it/file/82365295498.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a6c62db2359e6d0c90b9047164649a8b/xofebuxapesozanomem.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9075d76b1b29df167fc25b341a76d4d5/bikoxemopojafubafewavo.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/bodiv.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/fogavaruxowi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/311a0731b67f941c861356185d848083/96808632193.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609adbe96e84c---gujowemubulinuza.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qub1mq44eb163ldk2bd0e1ld00/75246087362.pdfIn PDF document text
    • https://activepymes.com/pub/file/tagepeboze.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af3033330cb---11039297430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=business+admin+nvq+level+2+answersPDF 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_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 10760 bytes
SHA-256: 05d43750b490f01b2ef9c33c5c5db3b29a0fda4fc5440977249ead6b8b1b4cf9
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 16380 bytes
SHA-256: 1c6efd0ed92ed95f1dd27543bd7695fe30f807d4d722ee0fb866ca97f8de3f18
font_02_sfnt_off0001307d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1