Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d39578b465e239…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 01:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e092e936a8033a9e7910ad79477311a SHA-1: a73c2a48f50b95e621e2d80e704595ea06a46446 SHA-256: 35d39578b465e239f099e8cf71b3f744d2260308e60aa5a6520ed144f752ee09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute phishing content or malware. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://medvor.ru/uplcv?utm_term=ngo+job+interview+questions+and+answers PDF link annotation
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/4422696559.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/07fb9aae359f0c5acb73aa2e457f9a90/99564155808.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bbbc0135a23a22341f370b4d87965c55/duxovumitebule.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/109746076.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/luworojewaj.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/mfdls2vndgabk3n7pl1u02vs1o/59640667333.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f689a928a---jirunelubepumodugobajir.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2c30a5eeb---66718317631.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/86249326829.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc86714111---fuzumafoxo.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/82140417412.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/xizodenefelumizoxawolili.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/682501611.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/bodagusubabutoselisovu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5d3e2e9dfc2bef35cb080fd449b0878a/33964839506.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/22294987761.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vavirab.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/12368224646.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/40434969181.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/78821303446.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/pazipalamabigelu.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/55843464784.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160782c274e911---52584452915.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/ramunonodapopuzusikix.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/lorekarevogavozamuzuzilo.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/fe5426dacadf192ad6e50c01179ef9ab/14192431150.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_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 16664 bytes
SHA-256: e40aa55a6c083b478ab2f8bd9f43cffbb8babc007aaf2b11545ac676c8ff0788
font_01_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB7 11020 bytes
SHA-256: e5050bd64866f446e6c5190853e0ef4df957ea68607dde114d8a8be0f9c6d014

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