Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fdb691b12fc4aa…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 10:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 59f0bc10670c2dbe13232624614f54d4 SHA-1: 228fcdc81035e53bd6828635208a97f5d56d29e5 SHA-256: c1fdb691b12fc4aabb7a6cc550ae87e80bccb24d611bfb9b00148e9ef2623b3d
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=easy+verbs+exercises+pdf PDF link annotation
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160752a239366b---25614207907.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/7688086834.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/3914639825.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/busalamipajutowikaxuvi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rifesomazenoxixorosowupe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b627ed97651---sojoteti.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/nidobuxidobulowukunenef.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/51542502225.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16123792e22fb9---kovoxuru.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/385a212bed2c230e5457a83840c8ee98/66483114330.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/97615556508.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/jogopazis.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202108180556343445.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075db048e361---35365655956.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ec1d78f7d9b5cb0fddcc1640dd82f07b/puxetexejagisezumed.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/65874042896.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754f0318ea0---27986580736.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607221de1df74---40059144552.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/vobigumekesimunagunaraj.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/t6mib9bah99ukncum6qpjttjp0/36231627107.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210815083144.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/43736830873.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/jarofivanifiwisuperur.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_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 10652 bytes
SHA-256: 04a4510067d189ec6ed71a817a2e9653217986ee9724f899970770c1e5cdad10
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 16596 bytes
SHA-256: 2b47aaeb33433e5d6653a33f9ab31efea9f80f4178eb2ef4a874ff07758d01c5
font_02_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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