Malicious PDF — malware analysis report

Static analysis result for SHA-256 be21077d7397c3a8…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 11:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af9f7e8ee43978e1e447c12dc06f0199 SHA-1: 619f4b60895370b8bfcde9cf3464fb116e81f9b3 SHA-256: be21077d7397c3a8d84c3115d2c80aff96e9a39b08f073718722886e24fbe393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931a562b325---89163301969.pdf In PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/nnqqb1l8ibhoh16p6njkecr7c3/maxiwafiruzejesijowaxikif.pdfIn PDF document text
    • http://zerosquareonline.com/file/widepuvuposowonarilitaki.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/29498407112.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/49832963857.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160deb8e468728---vukujenapalof.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/51209002816.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9c7a8d869e188f85ebb082723921b03d/70094710105.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/sofubobawezuxobimofemexu.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/23052127599.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3akb4drfq3vg1j1e333q12e0f0/25074351017.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a72b32c75---povopuwa.pdfIn PDF document text
    • http://dzbnf.com/upload/file///93256247056.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d70a6b0afb0---5914929277.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/22412038766.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e9f89e026f72fc3950dd3b92959cc290/fesivisixatilazavurigur.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/gitijuxorituzupojim.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/18752969698.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/befiwafiteluzadoliruwodo.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gewukagumeruf.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/61945393850.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb21aa73f72---dubezagojoko.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6ab3cdeec12eed6bc5b9bd38e3665f42/84052651211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=beauty+and+the+beast+piano+music+pdfPDF 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_off0000b8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E8 11144 bytes
SHA-256: a00a1a9b46bb5819c76f4e0194a22733b6ade2f16f8511370e5729b6403c26e2
font_01_sfnt_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 16840 bytes
SHA-256: a083e8582efef55790adbae25a072a5f40c29c15089e4af955132ea6f7f80ae0
font_02_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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