Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ea995f7fb328b8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 17:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d6192ab1357f56f02563fc56f7e4c75 SHA-1: 057ea82c7d5e88b5b85e6ba05786d60856997829 SHA-256: a6ea995f7fb328b853cb639ab9d0fd4ba17c646a1854189280b60820e90ada1f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The sample also exhibits characteristics of a link farm, with numerous external URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://penzion-pod-rozhlednou.cz/img/file/bipupexu.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130146e0432d---25963879683.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/49317417712.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xefosuso.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0fc1e3bfa9f178193384cf5d51c01774/25307461555.pdfIn PDF document text
    • http://splogservice.ru/content/file/73809286660.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/visexewosabobo.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/wavujeraxu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/dipoputuxuwo.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/xawotuxi.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/32756932613.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/21430683846.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/kegatavefupiviturin.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/sesepusonoreb.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/37269893619.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ad981f39604a483b2302c9089030a7f3/vabelopavirezixaxafu.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/34103892661.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/fozadurokegeteses.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/botonetuwevug.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/xamaxusifaxususodexitiwit.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/fosutabolagepane.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/tugugeripegogel.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/98692273722.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dizapukutivevepumi.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/76144368834.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/546403935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+dictation+punctuationPDF 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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 20592 bytes
SHA-256: 0854fb96a37e2c9c8cc06897981ecb808b7b7ad23655d5e2219590c42a4cdaf9
font_01_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 10240 bytes
SHA-256: c07090e1149c2ac569337d703fd2c16dd9ef3ce10a46c61af9b94fc6d2e78bf9
font_02_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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