Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf5638146c70817…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 19:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26f4a1f00dbd6fd0ae82518f82608610 SHA-1: 054ce2c322fabdc28283a872ac82ead19cb831d7 SHA-256: baf5638146c708176195d46fec78a18fd43316870391c67896ecef3d28fb660b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond being a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alves.bg/ckfinder/userfiles/files/26212464879.pdf In PDF document text
    • http://kvrhousing.com/uploads/dukuwumibojaroni.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/fazamuziliwezamifutir.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/lodegatasixeru.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/39442145301.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/16899776540.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/wabapi.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/6726475514.pdfIn PDF document text
    • https://granitnet.hu/editor_up/23115362987.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210911_001011.pdfIn PDF document text
    • http://dfanchem.com/upload/files/31137684133.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/72174565904.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/zizogerofuma.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7cf1f5b2---1106155787.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/91246629204.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/36336826183.pdfIn PDF document text
    • http://a-pluset.com/userfiles/ragutigodu.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210913_F433E5C21108EBF0.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210907124535_MTAxNTY4NTkzODM=.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dh6ds642bl3va2hg8rnbala52h/58435992769.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/11559709289.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f757b808c4---keredonef.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/44032042139.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/67586924240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+set+different+notification+sounds+on+androidPDF 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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 10600 bytes
SHA-256: 4b6d0edfc7836b7488350a79b5c5876227f0a68426196690d71ca0b9508bf20f
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 19848 bytes
SHA-256: b096d0b82ba7fc979bc05c661b68a564a52a0560a45f1e4d22a8d88cdb6fff56
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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