Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae12831e5031469a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 18:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8386002005776022eb5a566bf1a1022 SHA-1: 22c357067b5bd337ab80467677a9a0d3469c5213 SHA-256: ae12831e5031469a9ce53516f7f306539f947896d96e4822cde86da141b74429
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attack. The embedded URLs are designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa4fa137f5---jexadavimolatoke.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078000d8b594---76647453768.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985c6f3ca71---70146446660.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3jgj06qlojl866a8uvcs4mgjj2/81271658106.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/dobikagusamejadezekuvakuw.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ivhdq61sr6fv8q607ia0vctqb8/66784452269.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/119adafb997218180153ec6ced3cace9/zunizoboxama.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/b385b25d8cfa134ab1087889db424b89/70548843198.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092503b5c768---96116636721.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/ketinoworixasepedigab.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c6647f63d3d---53011510883.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qn4219v85rjmdq1bvt93363to7/vufirukopurego.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/63807494127.pdfIn PDF document text
    • https://clubon.top/uploads/files/vabisofu.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/zodazejigozaladakoduva.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c82bc7f6---wavibite.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161199cea75d19---76732787371.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1887ea6e---52459606863.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/43340637819.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40b58ee87---jonutojipizedonuleluje.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16230484661646.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/bemosojemukiwiboxinem.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74e081338a75941ee423de80fb871288/17481600920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=generalist+intervention+model+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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 10764 bytes
SHA-256: a1a22e24df5f73b83da33063164cd44256f356373bbe8d1bc06f7e96101dbf95
font_02_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 16088 bytes
SHA-256: b5793ccbc5a64056bcc341f1d5bccbec2c2cfb3a91c380616edfe6a43568258a

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