Malicious PDF — malware analysis report

Static analysis result for SHA-256 c510c36df1eabab3…

MALICIOUS

PDF

78.5 KB Created: 2021-07-27 18:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9fa488806160ed3a7fac29ec050f98a0 SHA-1: 63e5d65250c65e8fc2cb36284a2123fb7d16ccea SHA-256: c510c36df1eabab33e17fba51cb3dbbb9de5d70cc4ccf2b82575d915ae1f526d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, likely intended for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous links to potentially compromised WordPress sites, suggesting a tactic to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3004e80a3---pedidoweluxipi.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20da417ca---vakaletofowiki.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/89989293247.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b944e6f20eb---81410709149.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084adc2bce9e---85945355908.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/17387203796.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/90327139529.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb7625fd90---povitijavuza.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/jedakugojaxod.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/56483524302b92f0017029adc8d66e60/tifegujonowixejazoz.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/fezixuzutasukizemuj.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dc985c24aa7---74393400607.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38f608be3---99752742267.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b228733bb1---8036055440.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c053efba7630af45e16d17402dce57f0/vunifadepeso.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0105b9c036---71305850679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=public+administration+books+pdfPDF 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_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 16440 bytes
SHA-256: bf3b341c3e94a820fb6adfc981c7876866e6e1d6055751a0072c1fed2eb1b271
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 10980 bytes
SHA-256: 00f733484f7b1e83f344fee3b92265a08277fdfaeaa1515892e4fd2d59eff6c2