Malicious PDF — malware analysis report

Static analysis result for SHA-256 810b3958578e9f22…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 15:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 505b1a272cd77bc0be655ac1be56577c SHA-1: 03c42eb9f1aab7abd3fdba15cd7adac4e4dc7879 SHA-256: 810b3958578e9f22e22d5407754496198aea42715c1ff1a82525d77d4abdb0a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=papercraft+models+pdf PDF link annotation
    • http://masan315.net/board/imagefile/file/73347955354.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd66c6c15---sujagozisaro.pdfIn PDF document text
    • https://eravikulamnationalpark.org/ckfinder/userfiles/files/42170902527.pdfIn PDF document text
    • http://hadt.vn/upload/files/wisumawodibafowekeloza.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091914143634.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/91800732865.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/jemafusaxun.pdfIn PDF document text
    • http://henca.com/files/details/file/10189297912.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/ponigikewurudoxigufodapep.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/50541212042.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/16309240997.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/43fe913f5149d0a5b5f4cb0747d1b017/784072959.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/52238031825.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/46378466161.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411610b8c0f---14023712107.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/47157283263.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/zotixopigizupe.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8af7dc4b5c25885811215650f5b6a44e/gezugawi.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/73178110194.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/51546331774.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/mawenigi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xanimuvolozuta.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/xijeporetoloneketug.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161327cedbff2a---74740562792.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_off0000b3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B2 15484 bytes
SHA-256: ff6fce7eea9a132ab7a843bd8fe5ea9c817cff8f57ca1d19afea7c6c3287c62d
font_01_sfnt_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 10584 bytes
SHA-256: 9b09eb1c10f1381a55a0d97da7e154dd4e70d07128eb70c4aac5810dd4717ff4
font_02_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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