Malicious PDF — malware analysis report

Static analysis result for SHA-256 6508234f8e26ad46…

MALICIOUS

PDF

85.5 KB Created: 2021-10-08 05:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2b7ea1e412f73a8a050606d050c1e158 SHA-1: e06a6f56829d306326db7920b48bd7eccb506bcb SHA-256: 6508234f8e26ad4606a64820425f1c972b21f13b22ac15b0875e57c1a7a0cf28
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to lure users to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=top+eleven+gift+card PDF link annotation
    • http://mayjack.com/upload/files/basixabujaxedes.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/jirivebojizajazovezu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb56e097b9---82534060874.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/4765656711.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kobabumujumenosaxazi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/13477885859.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/nozupefuv.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/48688d822970f310d5264095848ed710/75498983654.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/22206159254.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16156230931bd1---44194650865.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/favomojevezibitifeme.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d19a2c6a52---74433486446.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/11628043274.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/getepifemofizumagu.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/55120760339.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/joluzerimesopojugulero.pdfIn PDF document text
    • https://dhesient.com/media/merajelisilizi.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/rajidiwuwejigiganopa.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/wejasak.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/jusud.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161567fd34808c---60766840048.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/13420115236.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/tosozogafaberupujapuno.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/31822643543.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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 19060 bytes
SHA-256: 30f3e9d25e453d56f3f3d01a8fa4261d01f73d0526ea3de437cf53c3f159d185
font_02_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 10656 bytes
SHA-256: 18a3bc7c7706abbd7a5031dbf335b1de7f52fc1e5c0912644dc8b7bf2adb0089