Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f5d89ffc4d2b46…

MALICIOUS

PDF

86.1 KB Created: 2021-08-09 06:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 344b3f99e4bbc555eac2a5e5e6e8958d SHA-1: cf6cb4fa7cd0636ca27448bdcf23008469eb4e63 SHA-256: d5f5d89ffc4d2b46570a313d4622fe61028d7a9354ddcfd80f513d6bc3825b50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://allytemp.ru/uplcv?utm_term=what+does+a+ulcerative+colitis+diet+look+like PDF link annotation
    • https://hantverksakuten.se/ckfinder/userfiles/files/niwezufidipotutafukugobo.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/vojutedukove.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/40545420004.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f3c93407---raxoraponon.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/51732479523.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160887c2b68fe5---35565584493.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/lumuninovupinib.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9103034d4f---vefofetaputefedosekawi.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/fewudagubora.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/xewirarebowasisanud.pdfIn PDF document text
    • https://sinarwaja.com/account/files/tigufalejuvedakerug.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baad5e66f53---28619917869.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7d894648d---penedosoxe.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/dcc9a0042cc5114ad162d8e0d7e2f800/53077092211.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/zawolad.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7c790774041821a76a0e7a0e4c4891b8/ganasobawamunof.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210716144918_0wtdut.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106280551556997.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/96495453631.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/govenegubapabo.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/rofopamowo.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_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 10612 bytes
SHA-256: e7f5393dffdfe30f0912a63a257a867c4ccd8f554dbd0d0d24fa74171233e99b
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 17284 bytes
SHA-256: 5c30619467cd38a59379fea7765151064bc962a95df7648c93abd9bc35da7020
font_02_sfnt_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1