Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c09d12bb3b28555…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 04:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4afcebc3e183d9d8bdbe2f2ab802ad88 SHA-1: 94f8c35acd1e54e3c2eca2b44a3a8da714e27d79 SHA-256: 9c09d12bb3b28555ba84ade9f78704489af60fb3958a2c5df5549690748dd1ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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.allatpatikapecs.hu/images/file/damelatifota.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/4f84cbf541d1a21bdf88cef2710d9390/rulebodenumuvefivirop.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/linukevesu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9635f4dd---78279494518.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ab0a52a6b---foselatewijo.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/98773587958.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/mapizo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1f0ab4581f98155eba7a836d2f2bc18a/73873558733.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/fosumixisegalipufisovomed.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kuwevusepejorup.pdfIn PDF document text
    • https://papiratisk.cz/soubory/69913380458.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/26594573476.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xovedudupu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jkndb5tiba7kn28ml6ehja9f63/gipixunazikodados.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/823460c6548faa848cf629d5edcd95ac/jinenulebarabilexu.pdfIn PDF document text
    • https://irrisyst.eu/files/file/wavufaz.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb50de82a---10376797167.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/xujejakafewumutet.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/79777336083.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/82014766180.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/82665406327.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210809091042352394.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/rinitalafoxebekomuneset.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/39984106147.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160f018e9ea713---rokegafoxirotido.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/27608166599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=types+of+food+adulteration+pdfPDF 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_off0000be66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE66 14436 bytes
SHA-256: ce8bec3f65c0739caa8f2f2661b24cc40725be570bc975065ef5cb98c2b7b7ee
font_01_sfnt_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 10668 bytes
SHA-256: 9ea26b2dbe9fbfe4dbd5bcc9479506c86dc113c3346191278f66c5c8135f5044
font_02_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1