Malicious PDF — malware analysis report

Static analysis result for SHA-256 45943e2934109f2b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 23:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0bfe1ccd51c8ea16db87af32bd676b8 SHA-1: 84732e3da7be7cf345d1af8845f94b60be9b6d05 SHA-256: 45943e2934109f2b269241d686f85e60495c276ef1e12baac01abcb5a84facd3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress installations, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tunglamgarden.com/images/fck/file/50014929905.pdf In PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/51473231742.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/dusibepokofivugulokop.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/webirupobinopitavake.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a068be6f4c7---50370870725.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/58a13c5f64ab696ab13e4c414c60d202/49625122565.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/84217752152.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/sadulisaju.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893343481c6---52794384856.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sejobuvipasedaxajonodak.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/99c08dc756f5b2bb003b628ce24688c5/pipevob.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/rikunamotugum.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3361a71aa---71552631180.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210705_821467CBE5FCA6F8.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/94446570552.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/89845460644.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e456d29f63---54029029256.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/97506183949.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/47628389374.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3c0853c9---64223126058.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fc94f4de291b70928a52cbe83e5e279e/73126091423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=diffusion+and+cell+size+worksheet+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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 10912 bytes
SHA-256: c6e924790f0a85dd368e7b6ec3a232c64644aed723e27dd34ad84a7991c1e0e3
font_02_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 15564 bytes
SHA-256: a145993ffcb94d16a71e2812bc75617f0d97ac277582518691913efbe2224122

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