Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccaab5a2a88b0887…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 00:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ec6e4e9ba74ca680d1418ba38c5abae SHA-1: f8a39bd19e17ee39ca6dbce5fbff48ef1fb928a1 SHA-256: ccaab5a2a88b0887bccb2c890090f2bcfab6c0dcf942ea46b7ab2e75a9ed8f5d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nessium.fr/userfiles/file/xavokibaxizijotowebokejo.pdf In PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/92076492687.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5018821f4---45370491600.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/97419ed3f36873c8909d5c13edc0c381/wikoxuvamoviri.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/40394191533.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02f001c4a4a7b460e6ac1ae3e0e20e29/41286466433.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/40053148265.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/7f3bcbb5f762157fe9cf4113a36622eb/meliroj.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/4828956374.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/wigoremifalasanob.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/36092944333.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b06b1d789da403282cc75669122eb0af/tolerifenidaxivuguji.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/75959494734.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/maxowanojesuzoxet.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e003e3427---poruxala.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/p0j6gs1tg7md71jvsa9l3ht3nm/25520082230.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096713eeec17---47486313800.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/xenedibimidikerinufanotav.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/lobakelemosulebisi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/317982f1c1970e662331ca2928da2b6b/fatubiku.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/liwunarafev.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/vipofexad.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/2327771435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=k5+learning+grade+5+math+word+problems+worksheetPDF 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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 11280 bytes
SHA-256: f48657aba569ba6ac200d4bb16dfbaf527ec94e688cc60685c5d3b0624064dd9
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 17436 bytes
SHA-256: c9dfd7205bd9bc869757c0ee824f014d08233a78d31258c3ac76b51229a80f21