Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7da1ff273f548e…

MALICIOUS

PDF

106.5 KB Created: 2021-08-23 12:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5322201bdf8b017a0c4d73808875e10d SHA-1: 5f855cd3faaf3ed74531f8ba8f536d8ba9379290 SHA-256: 0f7da1ff273f548e195e810dfc2737402b79ea418812dc4efe06cbd507d823c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cancercareresearch.com/userfiles/file/bajonabupurenabinosaruj.pdf In PDF document text
    • https://avela.md/userfiles/file/62874161534.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/fabajinimezov.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/93959600495.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/59313713252.pdfIn PDF document text
    • http://tidomusica.com/uploads//files/202108110253536202.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nilupatuzojigiwupujekodem.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607902d5a70e1---35099255863.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e2aae8f0---74905793547.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/tusukab.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d64a78c4f---70106809630.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/53166878116.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b93a85f9---gidudasagelurofe.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/mhcd48h0taesqc9pfd2jjt3v45/26947115063.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/38129837258.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/f7721d2df80d1c00bbe15a9670ea6e0d/zilagajekitonam.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/62542152326.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/xujeduga.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/08668b72d92a0d6c4344e52c468b7899.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sowig.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c85c56de---19632859039.pdfIn PDF document text
    • http://beijingteye.com/upload/files/roteziz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/cv7lcmmr9cvldo20ebk9looo96/52690763795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=project+for+the+web+planner+integrationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C7 17172 bytes
SHA-256: d26e8493a50ad14677fc24bb674213dfda2385c55b2fa61c2b9bb97934d0d064
font_02_sfnt_off00015355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15355 10948 bytes
SHA-256: e18d67b3f84758826ae833a44feb72c6c06a381e5192ced477b0d7ba21b4d0bf
font_03_sfnt_off00016c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C78 17748 bytes
SHA-256: 32b3566cedc5fddcb89eb9570f7595e9d7af8cd3b57b0fdceef6e0797d8729ef