Malicious PDF — malware analysis report

Static analysis result for SHA-256 2274e5ab9bc5820a…

MALICIOUS

PDF

88.4 KB Created: 2021-07-08 21:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 779cbeecb292bf55211fdaa1a6e86f39 SHA-1: b7b189b28ced6abc4602af56339fec829517a8dd SHA-256: 2274e5ab9bc5820a719fb2e4cbc619c8d26ebc1e32ac826d3284b9c4c2827d03
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and heuristics indicate this PDF is malicious, likely acting as a lure. The 'Clipboard command execution lure' heuristic suggests the document instructs the user to copy and paste content into a shell, a common technique to bypass initial security measures and execute further malicious code. The numerous embedded URLs, many pointing to compromised CMS uploads, suggest a distribution mechanism for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://tiramisu-o.com/yamituki-n/uploads/files/gufilifulesega.pdf In PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/200f9815f810f39bd5e5768064253069/31886463577.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f55d73d2e17c5796c68043effc804a45/8858562814.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/av3jen3jtthk3vg37av06h0vmn/zanex.pdfIn PDF document text
    • http://juha.be/_files/file/14356774014.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da02e4ab8---julojamodoluveke.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e4ea8a0ea5638c74369e99f7edb9c41c/bimatike.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/90606760561.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/zipipatuzabawona.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/533a2fa9dbaff890e5a66d2f0252b0b5/tejiritudimo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160841f514bea7---donuponunasupekebinem.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/017c246ddb5d893361ff6b8a88dd9d31/pijibinumoxademojubon.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/dca4039c11de4ea2524dea9e8076ad97/24117263015.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73c44808e---62147769478.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/44385483997.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96b029371---buwuwivawib.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dada4452b---fatodabavusik.pdfIn PDF document text
    • http://learningkey.org/userfiles/18093317727.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qtfbod0it2k8r8hp64dam5u8a2/pobidenuvupowotumedexiwug.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/52360582284.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/41875609062.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/12496600464.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65700b53b9---98552638205.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8cc6d56169fa4f1251dd9220555f38f3/24220207815.pdfIn PDF document text
    • https://superpart.com/files/xojunidisijenikovima.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/datilomefez.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9476b3c2---67035864550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hack+a+computer+on+your+network+with+kali+linuxPDF 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_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 17516 bytes
SHA-256: 320850a7ca6b79d21e1025ffb982c119f09817db48d545b27116bb09f049bdfe
font_01_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 10956 bytes
SHA-256: 6616982256d1ef13cf81153e536ed5952d215ecabf74ecb083972cd190a43da7
font_02_sfnt_off00013bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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