Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e964a4916f11289…

MALICIOUS

PDF

109.4 KB Created: 2021-07-21 15:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ecf4b0a2b96fc6e9a83bca61707c2b7 SHA-1: 65771efc458d3a3010289e6db5a93252aefe96d8 SHA-256: 1e964a4916f112891a0b6b1c66b6ea5a3f84b9624ad887dff2257871275ed429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://klinok-saintp.ru/files/11089138833.pdf In PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/30535292259.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c47f860d3ac0b7db58e2580f2de325f5/fasunevimedu.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/12308785377.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/92699627052.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/164913276760f2b10db9c5a.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ebe32da1---80884265828.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/2303839651.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dfd9804548b0369453f7602ee7ef6595/13464368360.pdfIn PDF document text
    • http://schokobrunnen.com/idata/28620206750.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/a0ce937d2ab9385d29b4b5097c143e27/6367836722.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/32690798621.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/xisugudelavuluv.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9a4b16c4fe36d479ac3997929a0153a0/80116169107.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/99852e0f1bbab5944ec6d30bbfea7ce6/28571163289.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/numujagozanam.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/52094441327.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a997f9a2b7d---jedisera.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/kajil.pdfIn PDF document text
    • http://cga82.com/admin/File/tiwiliwoxinexix.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/mejinapoxevojudepi.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/xabajujegig.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/vagare.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c14b7cdcc8728075c64c982d439a8761/xunitatolakoxemipo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9v9avsgg8kptci1cgjq1p3h8a5/burabikaziwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sex+and+the+city+girlfriends+are+soulmatesPDF 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_off0001475d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6F 17360 bytes
SHA-256: 4267571f9c6ee1cd9beacfe8d6ce643bec6a5e8b704590e25b12f994b6d61f4c
font_02_sfnt_off00018c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C9A 11312 bytes
SHA-256: 3a0f8f5ce21f861315dfa8b903021926fb519eee3a4402a5540710ed251d91ad

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