Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ee9f0badce5728…

MALICIOUS

PDF

148.9 KB Created: 2021-07-03 03:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6e7e9461121af99b8bfdd93918eb3052 SHA-1: b4826d970a1e8e8bb5d7bc5893badaa124d16b46 SHA-256: 31ee9f0badce572866a3c4df72974d340ffe756483a62316b5610a9559ac7c44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The sample contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to redirect users to malicious sites. The presence of numerous external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c95809d2e2c---rupupejajimunevaxuxala.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2dd28e30a---64551537550.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/64197006138.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/52218298071.pdfIn PDF document text
    • http://www.heksan.com.pl/file/lipofixisiwekavusinedusi.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/76466251729.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6852judr01j1jm156j07937be1/sizobazenatezodolaxapo.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7550ee98e4---14197162852.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/ab09a24adadb693120dd93953c9e179e/kewefaxerudaligad.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/51850530496.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f44dbb81c52b44815e78aa70a322b40a/vovajoj.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/jigugunipofulumufumi.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/95479384271.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/7133368824.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/sevasozeximemujupaxew.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607293fc763a9---68793036938.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da5c21de2b0---32939415352.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8e02d618e160e481c9e2a73e600a6e9a/rolupadupimomu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6034e4s5dansa6vuqs7ikv0up0/gugevetowafide.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907d08b16c3---14484040272.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/37537757087.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092800f8cf58---58215916041.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce62d5b011b---zegamisarutogirovajulas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=scripture+on+not+provoking+your+childPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D66C 10908 bytes
SHA-256: 8d82b861234463cc11eba886a7f68787c7bc2bf07cb9339abd2679f39f9415f2
font_01_sfnt_off0001ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2077E 27140 bytes
SHA-256: 61bba282532032939655c9a114d4e4884bc3304c97a882fee0666ade50c0fe60

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