Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7e74825f9abef4…

MALICIOUS

PDF

97.7 KB Created: 2021-07-30 20:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f372ca791999e9c9caac6fd72da9a5f SHA-1: 31b5c66d77cbe9b8f1c55d6ba9bdf6f535064524 SHA-256: fc7e74825f9abef404a9db7c40e90f254d25a573a7b93e8418ccb25503d1494b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are commonly used for phishing or distributing further malware. The presence of these links suggests the document is designed to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160846a18e21a3---zoroxiburenowonuw.pdf In PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/bawasixukejabeneteru.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3f76de6e---direkuva.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd4893cb0---sazatilanigeb.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/2665026271.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/50014264991.pdfIn PDF document text
    • http://www.agot.pl/upload/file/19410892201.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3p3cqd5tvq8vdtqt40nss7pakb/fagabimirudogu.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/65567020814.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb0320036---28213404966.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/pegujofida.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c554462b4---24524257529.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a2cdbce48976e81d51de908ad87bd9e3/digakowanikokegupoj.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e52fb118c30b0a72f1b2ba867ba43382/11043256494.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/nejutarujosole.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/pakegadebukunobakizinuwo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/mhnbembmmti760uf3m4ocljra2/mozikozaboxatetomime.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/tijofogapabidafokab.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/36885387443.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9a38417c692c3f90585c4ddb6871e2d9/bumirilomakonazu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8de0bd5f1---detumevubiwig.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/992fe123b0084e49f59b89ac745e577f/rikaduf.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4d33b9b0b---dabonepagizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=is+there+a+way+to+get+around+breed+restrictionsPDF 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_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 17316 bytes
SHA-256: 9e243ed5d85c70a3e27c8e855bfc16b371fae9561278cc480ad88ec409191658
font_01_sfnt_off00014688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14688 10992 bytes
SHA-256: abbd8636e0d994d90eb6d5e7045ba2641107556e0ee321567ad58deba7ca67ac
font_02_sfnt_off00015ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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