Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b3215d609fc9ec…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 21:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aeef3a3e0bed694f7e2d9b0b03ee4abc SHA-1: 200df08f31e938550a3c26d117a45212900e819e SHA-256: 32b3215d609fc9ec860bf901467039522053a33268d3883e88e6a396123439b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://chcial.ru/uplcv?utm_term=miscrits+world+of+creatures+download PDF link annotation
    • http://shiny-baby.com/fileimage/file/xaxoxoxoremawig.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/dogumanuveluzan.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/pajiz.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/70579853525.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/88828039223.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/19256729835.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/6c508ca2cc63d4f3feb49dc21e5a5cae/bigudogixug.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec2d7553b---61486552390.pdfIn PDF document text
    • https://slotpt2.com/contents/files/6554652037.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/90162244931.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/togovexulibogoredi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614639a362a85---79423254764.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ddk03nqp06tk6r1lskritk0u2k/94357008104.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lusubebizigazasise.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/jakapigoxojunato.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/tutajuwugokotawigogudakel.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/84626083385.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/xazigaferap.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/43503660941.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/zizidugelekuv.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/nutogejolerep.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/zifutomitaduzug.pdfIn PDF document text
    • http://canvangdientu.com/images/file/35122957596.pdfIn PDF document text
    • 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_off0000b17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 10648 bytes
SHA-256: 0cfe564a20fc28717e8a084e7ff345485a457909a6aacb50216cd84881ae7478
font_01_sfnt_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 14380 bytes
SHA-256: 72f6f7ae0e159ba06acf83d66928009fc6bfab86b8ef13f9c4fafdde590c8a9f
font_02_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1