Malicious PDF — malware analysis report

Static analysis result for SHA-256 353b3f683d11b79f…

MALICIOUS

PDF

91.5 KB Created: 2021-06-26 02:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acc5324483a9d7fc151a04f724493d52 SHA-1: 0ce98add76c47035af0c107da132be6e22349998 SHA-256: 353b3f683d11b79fe6989a87e9927995ba6d6be9ba8dd942a18ad41e742adca3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress sites, many of which host other PDF files. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://abpaluso.com/upload/file/7092329263.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077a46ccd4ee---demesifakasakimifoti.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1e1aebfd1d5e331f3d2f217f43017375/wozesovow.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ba392b2b---59564182408.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b42ce8626---gaxizibi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1886bee4e7---jubibabonumexemejonari.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/918da1b93a560f0f74b018805d0ed626/59971525297.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/05e6e8f5f943ab73a6341b1b41e7e42b/taxikez.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/52c3355f018617f69747de53ba136eab/79914057311.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d24091daf---werigomufo.pdf
    • https://bbpartner.cz/userfiles/file/81599638777.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tfhsa528ld4svauh1cv23f6pai/sisezuxudetale.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac4c65a5ddc---65607264076.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160922ba7ed15e---metapib.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd9952505---pumamanotisemavo.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9vb34a6hokk7mrnv77e99jg4h/fupixupikugajobaziwoj.pdf
    • http://alexhofford.com/temp/files/file/60702405246.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/3812702932.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5mvghkrs4h6ht3ouf72tjn7f04/xeluxugux.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608744f134762---nademinino.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/234c0bed91a209409cb454df6332b3a9/vimekagenapibosoxirowavug.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d629d24ab33---83535795806.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/b11a87a48b44389e45a0781e61e89d66/28332771461.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mdlq2btns9e4kic3ei8mgg4j30/jezabesutipokalaw.pdf
    • http://akkoryazilim.com/userfiles/file/98385518670.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b779622683d---zanosuja.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/da928c78eb93bc9a20e820d3e6452859/gegurawapikulomiwiniwobe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=derive+the+formula+for+kinetic+energy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58b.bin
85d854158a6fe88443b9f1ef7f90f2159ab9e1621055c85a64bdb57f742882cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 19492 bytes
font_01_sfnt_off0001194f.bin
4732a4d7ebdee6107b3b2c95767635ec7cb7fc566763d7cf6cc791a1bc3f5834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 10988 bytes
font_02_sfnt_off000132b4.bin
d06246de5fbca08a8e71b3266423534d5cc020e17a1f81eafc946de7058d617f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B4 16088 bytes
font_03_sfnt_off000147ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147EA 16792 bytes

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