Malicious PDF — malware analysis report

Static analysis result for SHA-256 a742c25bff68edbf…

MALICIOUS

PDF

76.1 KB Created: 2021-07-29 13:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c7d13305643f16cd099c7a124c8403d SHA-1: 2b0b1487e70aee90e7a77129c31e509d651ccd49 SHA-256: a742c25bff68edbfbc4a4b31d9522852ea66d57e0fa0ded4aa6a090688d5abf7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and potentially distribute malware or conduct phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/105a282cadfc017a0527e7b006230cbd/38845665042.pdf In PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a794068e5400ede4084e194505075e58/piwirekiko.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/99471149737.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/90220420007.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/93327882381.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/85600206329.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072605062473499.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/24710047802.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/durhj9vg8tp4to7g03t3ledao3/pinoviwudebalax.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/63573015821.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/672f0f95d9ddbd6cd796048098ff0b04/7213803438.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/97484f12005a8482de52827d57055734/69197371463.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/57377517426.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a77adfe1d50ff4c57c42959cd7035504/tewirasedoluxifisisele.pdfIn PDF document text
    • https://actorconseil.com/files/file/54258267261.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/55335836047.pdfIn PDF document text
    • https://aedwea.com/upload/foto/ruladuvo.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/pasuduxazulukipamawit.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a54bafa7e---guvefowilowazedigapuwidaw.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/6862425729.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6eaa7aca693b78222fffc99fdde94349/totopofiruwivez.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/kopowopovutewo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b345c1995---bekapukujofakovosilapuxo.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210526214507In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=spongebob+fun+song+trap+remix+mp3+downloadPDF 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_off0000c655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC655 15752 bytes
SHA-256: d6b1c491bd1bbe6f03b5ff61e49b1eec6b4f52b60af36a0a8979d6fdcd20c5c4
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 11516 bytes
SHA-256: 7b403a855138b726a5a949753190d329f9e40796886d2f16d9c4e34383d8c3ea

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