Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead8cda62625a761…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 18:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d66b6ffaa2f845d82bec16c71e1e02c5 SHA-1: ed6763fb7acb87d03db936bc215f0902042d2314 SHA-256: ead8cda62625a76161a5597c36e0d135c3bd58a4c5ca889a05aa1ce7ad6bb7bd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, while the link farm increases the chances of a user clicking on a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/81b69e98c8c8c124f64d510864c390bb/27859251989.pdf In PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/c68bf843f9bc998c56407f26edfab506/27865604816.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/lexelo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/rg2vs6rl3kglq9fo175911lcb2/buzobisubis.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rpr93sb2ltbsodahnnt1c9io2s/36288806886.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210620_101535.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/dc33ead933721bb72f5035edda69b53d/7741813531.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/93149026176.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c267d682c9f07ae5be0ba89c64f496db/87135431791.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607810572514e---54359133004.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/48089715783.pdfIn PDF document text
    • http://yuha.be/_files/file/mifobewefepo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e09ba53f8dbf48e830749639a2de55a7/15334434054.pdfIn PDF document text
    • http://savemaxint.com/files/file/42653292485.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/sifulolujetegogofesot.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/45fa8af31238ef5cf9e700cba2d6017e/50511071578.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2d0a148dd---49044751324.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/41067317903.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/43227186235.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/nekufumevaf.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/dimalofaxudupovupamexed.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e7a7f7b2---20216338674.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d02c2456b---10593404917.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/t2hrke55q2qc4l244dt445fke7/20020485257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sony+mirrorless+a6000+manualPDF 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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 19128 bytes
SHA-256: 852eaa87e686b91a91ae96f43c32a731b0858e1d7fa497c79ee2c3236f9e3163
font_01_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 10752 bytes
SHA-256: 6beb5fa0f21128869aa70792e73fba49f66b0c0c29277b4f272737e683a1ab22

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