Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f781465363d8556…

MALICIOUS

PDF

81.3 KB Created: 2021-08-21 09:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fba1ae074cf1a40fcdc190da442a60d2 SHA-1: 5258b6c00f4127a3cb1eb8129187125bde1b6e2a SHA-256: 5f781465363d8556b6d6dd0c68192c8fa92b2fb7ab7c6f06d960ecda6cb20f23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. While no scripts were extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e526c2515c1---zugaladarovuvosegol.pdf In PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/boruwunazipelerofuvo.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f0e04d3ca28ff90fdf92de25e2cc0e95/49052628173.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/fufiwow.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a1818f1517b35bb4c11584488cbeaac7/99977307685.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/gofpbvleb63kb4j0r9vbehjf4r/23348861399.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/l1bmvma91drnab1rhd07m5ao86/17185448623.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/zesozewotuvekuvonezimi.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/80941352368.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/19429439075.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc01e32d60---43992477332.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c893b1786---24337244275.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/21352462482.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/10578616450.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/43374999811.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bdc895b07a8a318d8f526bf7b41b8843/3433745484.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/novor.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/ginajan.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/dupuxada.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a153d9b7beb---58219617574.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/kozawuzusagab.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/51822390966.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/62871388669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=simply+piano+compatible+keyboardPDF 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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 17344 bytes
SHA-256: c0dd7f7b8aecd285a88ab5b382c24fb9785fb805ce13c2e0f0a4efa033817232
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 10928 bytes
SHA-256: cc5fde4ca46f3e4512091823c9fd7c989afa1713068766e98214f01fc13b3fd6

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