Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fafb4bb8b344e1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 14:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a65534f79f1c3747909ed051d25e3d7 SHA-1: 34862bd45f1c7908d7de53c91ecc5c0b8bfd1cf1 SHA-256: c4fafb4bb8b344e1bbec59bddf87afbdb7e74752dfe2a7e7e6ac8cabb253cced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The URL 'https://smidgel.ru/uplcv?utm_term=download+app+mobile+legend+bang+bang' specifically attempts to trick users into downloading a file by referencing a popular game. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=download+app+mobile+legend+bang+bang PDF link annotation
    • http://peoplefineart.com/assets/202109/files/20210908045807197197.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/17633700196.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613666135a9cd---26065179166.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/bafedakixasuvejalo.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/73084035963.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/wiwubiz.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/tukumutiviv.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/zupogam.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970c25b0eb---xinobekimepogalibusowoxe.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb58f0c80068d5f99471e90dd56120c9/41148627094.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/madugaboloxulanojazopo.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/suratamekizusob.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6133c624358a5.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/67790791873.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/14652672560.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/93230739369.pdfIn PDF document text
    • http://irths.com/upload_files/files/fikutix.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/bolidojotevibapojumudelo.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210904_A283A464E6104F0D.pdfIn PDF document text
    • http://tcihk.com/userfiles/lusavogokijixusekijakobu.pdfIn PDF document text
    • http://theponghop.com/upload/files/pafuzevotoromunuxulufob.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/77380727332.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090411361873499.pdfIn PDF document text
    • http://vejwun.cz/images/72119315260.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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 17956 bytes
SHA-256: 65a7fd4a2b129bde139c7aedf41e92ed146b2f7fec45ec76605c8d2933ef0378
font_01_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 10596 bytes
SHA-256: 276e5265f9bd6fc179b6dca1925d613a962c9b32df4f6441ff6962b0a899634e

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