Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff314023ea12486c…

MALICIOUS

PDF

80.4 KB Created: 2021-10-22 21:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0bf3e2ee9ca47881004fdcb1212650ad SHA-1: 6115714e62fa31f89737a7b12c592d28d8b3c032 SHA-256: ff314023ea12486c3832a492cdbd499dc1b443823c545db7e25cdfa142c7e732
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://krisoc.ru/uplcv?utm_term=baal+and+yahweh PDF link annotation
    • https://holcom-wd.com/webroot/img/files/214941597.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/10576109321.pdfIn PDF document text
    • http://mayjack.com/upload/files/zimimasafo.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/sodelimew.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///59564222072.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/jujixefanaz.pdfIn PDF document text
    • http://sns.hu/_user/file/lejadipefusar.pdfIn PDF document text
    • https://cubic.is/userfiles/file/xegalozutijanatev.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3a0e761ef---20229640923.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20211007_214348.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/90767987197.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f3e850993---29389571238.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/35833661191.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///37291454781.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8debb16a---6449801231.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/pobeteleliregejuvowefineg.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16162d58137c20---jiwedixotemidikolu.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/nabolewaze.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1616f41f34e0f6---62243290632.pdfIn PDF document text
    • http://mfcpavpos.ru/file/59073507457.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/jalejov.pdfIn PDF document text
    • http://safetruck.gr/images/file/lepigako.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/68799087950.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/bazumibigorubatida.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 10020 bytes
SHA-256: 281b76b7c7178961de54495684ad76a85e04c7d31f8d7c80429b48db940177a8
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 17696 bytes
SHA-256: 110844ae30a7ef0e4a395d8a838a6f141fdf9e4d91fcbdb24efb2ca4d63df1d0

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