Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06f54d4deb23448…

MALICIOUS

PDF

86.3 KB Created: 2021-08-02 10:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0b2dc0d5f626a3e5858cbe9d5df0ef8 SHA-1: 584f0162414548eadd229d0310065c9a93ccd717 SHA-256: b06f54d4deb234480c9d00fa16f7210bf90ba61898688c78e1d678947d51efaf
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bloomx.com/sites/all/sites/bloomx.com/files/96063471552.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac33e60fe14---96081205418.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fea8cvd11r3fpraa68t7ndpdek/67243529994.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/67834176630.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/71741925507.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d6724bae78baa87cda35da28d3c1865d/37760444222.pdfIn PDF document text
    • http://df-foundry.net/d/files/ritimefiwutunanepuzabo.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/vikirewabekujujos.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/53415434949.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/nofugida.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/vuviditiz.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/9199062372.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e46ddba1---jixivobiv.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/jatiwiwujibefujawe.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd60f8a7048---26842175356.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/remoxipob.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/6493019554.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d2fd78083277a38a41a98935b1f0afa1/62623589076.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/6133802689484ea36f6015cc3b4da83a/gulamodufesiju.pdfIn PDF document text
    • http://sdes.in/uploads/mukejek.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1e8d233e554219eab779e36876ec467c/15693949456.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/isprlfnkpi5e3lb6qt8s3dafvp/kolasefo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607337bd2c3fd---tapetukudajususafujer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=heather+sheet+music+piano+pdfPDF 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_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 17360 bytes
SHA-256: 148aae97bb4ae6c0dc8fe094cb1ae8f44fbb2df8a8d83908a4cd62aad194b410
font_01_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 10932 bytes
SHA-256: 8841bb2730b95c7d0697fb0675bc5233d400a3115e4e819ed6a3165e17aaaff7
font_02_sfnt_off00013271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1