Malicious PDF — malware analysis report

Static analysis result for SHA-256 77544f30d2c94e37…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 04:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 021835bdb085e2491d9d9d9de51e8f5a SHA-1: f701515950bcff8d1536119bb9cc370fc20d1f53 SHA-256: 77544f30d2c94e37f916821c830564d3d986d98d4eba421bb135c15fdef0e0ae
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct users to potentially malicious content hosted on various domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mm1mt5otthv95qi8ir94reship/gegovomevubunefowani.pdf
    • http://kaies.cn/upfiles/file/77438322093.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b527c3e60---fomunujurinenepakuzitire.pdf
    • http://brmxn.com/userfiles/file/20210703083331_4xbj2v.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/22c8878109de6e347653ba3d273ff431/salesaravanegijisu.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c86a82637---721643799.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a899a944853---81292186163.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c02c0f1b---rufugizaruwigixojepuvaxaw.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a942c6432ec---bafed.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a2cff80972bf09889e8e7e6019301127/tulopokarafiz.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/62467edc6bb113315364f6cd8f10754b/68781879770.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa1182126---61191776832.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4395ead2a---sofebelerawipakesa.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/nipodujurevopetatemox.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122e7e7213---59781271994.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4a2537e6---79258730982.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160be9d2d04263---dizewapi.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/23687298404.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5a77bb93---63170057289.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/vobuvemezip.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106280124542164.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9bfe18be---kebitovokuvife.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/tigugaxegototugitafomob.pdf
    • http://trunglam.vn/uploads/userfiles/file/puliferelu.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7d4a497d3ad3624f340cd419db1a4ed0/75182951986.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/hajvf75d62jb8j9k1bn6m0iucc/ledese.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bc460d67---70443273397.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lateral+surface+area+of+hollow+cylinder+is+4224
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc76.bin
72ae2864a929253b0eebc3eb671a476a51dc6471dfb40dbbd3f1df36f3c474cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 11028 bytes
font_01_sfnt_off0000e63c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 16792 bytes
font_02_sfnt_off0000fe4e.bin
fb8aeee981cf14c31a75be000b062bf5d8b089797cd7394728e44b4a12473079		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 17804 bytes
font_03_sfnt_off00012d62.bin
94da071d87cd7ee37ee961f4999d5c8ba7ea74871ed8c8102e48280920c52ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 1780 bytes
font_04_sfnt_off000135c4.bin
16a72c2fd11e10e3126b62e046def008aa0ade76e7b7063adf995289b65b935b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 16220 bytes

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