Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac4d159d650bd78…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 21:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7785e1785364d4f46a690606cab0beda SHA-1: 3b9fe3c26bfea3eded5832be666867a117a40ab7 SHA-256: bac4d159d650bd78ec482db2ebb71069a2ae6ddce81886185aacfc54544c197a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as a lure to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076745972f43---67643913805.pdf In PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/77691177132.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210522214839.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb312c080---jexilesezokofubajovuwip.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094d19bdc3c1---69307635227.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/85463314659.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/er1en450e7l7h1cmmc3njcr016/55150877573.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075225c550ff---90283760146.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/fomemewerawatezomax.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/semadevazev.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/xajotisi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ji47vkmjf2fagf353mldcb6vkp/92814659232.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/90d87241ca731d7d500c7c5c41f9f3f1/remevizazevodakata.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/89561458416.pdfIn PDF document text
    • http://gabortech.com/admin/file/pavewelojowasubazeloda.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ac959ecd6e222250b746fc7a40f01629/gazebiso.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/38278293184.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021081101125673499.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/55990311636.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/639788b39355379a6dfc244207510cc1/sebaxovejupix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kinematics+and+free+fall+problems+worksheet+answersPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/26027619779.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_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 11192 bytes
SHA-256: 6b3e4b7ed29fa1f77108271e87bbe7b599f9373436a5c9ca04b3f282f1aca423
font_02_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 18120 bytes
SHA-256: dbf38552fcd2e04021750d4ce695e32f1222724578d7b7d1cc3c244817537927

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