Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8f050942e3811c…

MALICIOUS

PDF

87.7 KB Created: 2021-08-19 05:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 083dbbcb85193564353631b87a2f41a4 SHA-1: eaf3810fe3b17dcfa238c4acd1286be2434783ca SHA-256: ac8f050942e3811c3702f7b77182c51e7f4f3b7fc2d2644694cda73302af6ff1
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 phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious links or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://eternaseguros.net/files/files/pegilepavanarididadijud.pdf In PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/90287953539.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d63b02562---6591910113.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/31737362388.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455d71be60---90828743681.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fc0ce6828---89011271497.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161125b8d52c1c---36939792635.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fuzikakapuli.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160774fa8b3bae---mogatefesaromimane.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4342db8dd1b18e2a91318c90d5a94263/muvonabomexefenejakize.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac13c100180---93464517944.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa0e4a24ed---pobanaxebujudeguziruf.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/65790762046.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15df5724d0---morinego.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160844ca0d36cf---93329388481.pdfIn PDF document text
    • http://jarosi.hu/files/file/xelorifowufulat.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/08/file/rixurabapad.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4d34120c7fd46b6e40e89f5be8ee95c/12485844851.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/18322327078.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/maripabisidiroxaxulevunel.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/54198437672.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/76807021983.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/xabotisofedi.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/toxefuxenokopuvipivonidup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=quantum+healing+hypnosis+therapy+dolores+cannonPDF 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_off0000db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 11236 bytes
SHA-256: 03434ff931666af6e0f7573727a40a2c5927e82791bd2f4d7fd766247db7143c
font_02_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_03_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 16584 bytes
SHA-256: 12d6c6552edfc7b205801f79a600a4cd11233db62d3b0a6cb9d3ff96bb8c82f7

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