Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19e563057fc9a53…

MALICIOUS

PDF

90.7 KB Created: 2021-08-27 05:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2581696a7ea9f523d171bde6af2c216c SHA-1: 5c0abe873300596466ac5e14617f8801d1313a49 SHA-256: b19e563057fc9a53a16c27174022d7abb29e2c0873d16f9a880b081da4fd4720
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains flagged as compromised or disposable, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://marblobaths.ph/app/webroot/img/files/28686667880.pdf In PDF document text
    • http://www.cerathai.com/image/upload/File/27917730858.pdfIn PDF document text
    • http://livestocktool.com/d/files/bawiwobefit.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/48647652589.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/wewul.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/29867fe198efcf53ba05bee65ebe2acd/rusajomibiriwibizosas.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/metetevo.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/66737183990.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/14ad92e9bfe00a5aff0d8a6c30733fd0/35469788403.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/55129647931.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16102cfc8a42c7---mekit.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/65230658817.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9164d73e---votedasogosozawumi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061cf4ec05---pijanudaxejizuzuvawafibo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eac43faba---8670471937.pdfIn PDF document text
    • http://skomi.ru/img/files/file/lafokikafa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bd7c5c647985f93075a233925aa6e191/fawufaxowojozixadazi.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/57674483017.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/08/files/210811114836.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7435c386af---84610072258.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qgsdp07irbfbtetnkfkvodurpq/48061546495.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079792458ee6---42062832585.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607119c7b0255---87095415295.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/99988610616.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/4a2f0e2a9a5ef9db999fb096ee84f22b/potoruvoxivovod.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074951f93af4---21945899575.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/wikupofeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=factoring+polynomials+examples+with+answersPDF 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_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 16464 bytes
SHA-256: 3f322d8cff5e9b66f6060bcec0865efc6ee813a287dfb9068c3d99277641b0dc
font_01_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 11100 bytes
SHA-256: 0d0336202b768e9b0ddf006ab9ba8a4f835b509a09c4f9ee79fa4c1752525624
font_02_sfnt_off000144c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1