Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb1187dd6b2d386…

MALICIOUS

PDF

89.7 KB Created: 2021-07-28 05:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54d310949b9907763c71fcadda7094a7 SHA-1: 8189e69b99eb52fcb7605d9aa9affb2a31fc1d1b SHA-256: beb1187dd6b2d38678a5660ff9b35c455922bc62991d410c0435da37d2240fcb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to potentially compromised WordPress sites supports this assessment. No scripts were extracted, but the document's structure suggests it's a lure for users to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://digireg.it/upload/16324450491.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/451e57704838bd8c4871b5443270a31c/denimu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6e5afee3---vosidesokadelupevelule.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0i29n055n8bke2gqhlu76gfc0n/28982028041.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722053a1f8c---rubudili.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d41d0a0ea---gafaxivifidezinajalisa.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c20286a8be0---21579303351.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/gidanarinoxanom.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/10362963043.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/79582552505.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/93978301083.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/rogebivemor.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a0d0rv5p4a544a8rqbha5u3ug6/paburuvovepato.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf667070ec5---91344393071.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/808683364.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/gebuwufevof.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/werikezisenakubu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/c00smgi399jpmpcshujbd5li4d/97272833210.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/15381990903.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4b7d0512aa5c84665cc6412285bb5abf/nuvedorokazuva.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/sogivopasovuvavuk.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/591931627787b919cc12c01e7fe93f05/forugile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=problemas+con+angulos+suplementarios+resueltosPDF 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_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 18964 bytes
SHA-256: 08a92cbed63da289640e4f5e97081379fbe080012cea57e9ed4cdae09695033f
font_01_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 10960 bytes
SHA-256: 0ec17970773149e2fbff4ad14d3fe4953de7dbb3e5bac1830b08f24fe1f21dfa
font_02_sfnt_off00013e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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