Malicious PDF — malware analysis report

Static analysis result for SHA-256 88834de484f39e46…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 00:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43a4639f463c47e9c573e6f7a5ccdb0f SHA-1: 07055a7bcab9fe8ffd25256c1f87c19ab44e4905 SHA-256: 88834de484f39e460d8479182bf7758f7dfcfaeb7b7e2905cabf80f448998468
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's purpose is to lure users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maslatalaia.com/userfiles/file/tenaperajaku.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/e4af4025a25873a9fad5de5a93c6f45c/tonogevudupepenije.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/wopenitimu.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/71117809231.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/foroba.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161425f014f24f---3538967509.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jruft6ecb9ln7l8fmeqq11vm1/55615543778.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/44279617837.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/zafoletodepixorutifopexo.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/98946046101.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/77863339779.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/mamizufizasofuwuguzoter.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/tokanimiwujufanigujaw.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/61030063317.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/beduwojanezajalawozafepi.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/44706292355.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/pezafetitekojowunogiza.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2ec4ff32---94454248014.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5e54r9vqad5rj9hp0nc57s1icl/mirano.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/fetetimolobuzelozunevuw.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/vuwarumi.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/wafunuzawuretuwibona.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/46321453253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=scrap+id+unturnedPDF 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_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 10348 bytes
SHA-256: f11ce2f0baefc64c9f33c3d9789bce30efa74055ec0cb61c023a8cde99c53592
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D0 19880 bytes
SHA-256: 3f04181e68ab182625a066ddf363ce55f6def23467ca43bb2bc2ce79adbc7119