Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef22e1fbf6e139d…

MALICIOUS

PDF

93.0 KB Created: 2021-09-04 20:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90d5209beab7913b7772b98b4f3d7799 SHA-1: 9394734f57645158a4c3d58162904a5d99cb7c08 SHA-256: 8ef22e1fbf6e139d6e245731fda0f548b93a253b1d2ae295843995d0b5b632ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This 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 various websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of external URIs and link farms on potentially compromised or disposable hosting suggests a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://huntic.ru/uplcv?utm_term=energy+systems+training+pdf PDF link annotation
    • http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/lorebesage.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/10531164266.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609888b63a770---zokovupotoxoketig.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/zutoj.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/57d2cb4a132c67605940d9558d822c7d/mutiwuje.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a26ac1d1---gixifotovekugojop.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4124698deb---puterekokafugajin.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/jarizaxilofuto.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/fajiseletixirinop.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/43468316063.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/sugisu.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/83679359668.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/31195068842.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nagipadimarawe.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/33918689875.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///lidenulikibaxabelowobejek.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/38355218667.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/20f4c91edf0aa74ce233b45a2832c6ea/verebudud.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161168844f0710---33962704542.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ef92cf1a4---54183453943.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084987927b15---94296590564.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff8cbaaaca---juvawidomewonetiseres.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/50142362090.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/setosimonox.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da45ecd105d---xibisadubibuvubetuveko.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106231127.pdfIn PDF document text
    • 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_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 19468 bytes
SHA-256: c083270624ed926ec9ddd5a654c14427a5736d31ad4ec72c13ab8f6e9ae498a3
font_01_sfnt_off000135dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DC 10772 bytes
SHA-256: 5b91a86fd193943d83bc09dad02620e126936e59d33cd6a58bb8c4f1ebcebdd1
font_02_sfnt_off00014e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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