Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a1e6b079999788…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 01:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f295cafc25c5d0de8ff8d7639f4cb8bb SHA-1: 2536737ca8277f81a2cdd9972b7b43db7ab65357 SHA-256: 15a1e6b0799997887e124821b2ff43fce3ce574f2265baa5dc20833e3c77fee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alarcon-v.com/editor_upload_image/file/vaxugozusigolu.pdf In PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/6170610551.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e98ohrgkeh9hji3a5qjenm84pe/90684730358.pdfIn PDF document text
    • https://terracell.pt/images/file/tutekazoguzonekalezaditil.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b158dbf6e8ae202e0a3dac1c376427e3/75481386201.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9aa0b2da3---14613264920.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a228411cf76---gidonojofalimozub.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e880008c11bc84d193048cad87d6b849/14447440175.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b02c8010---56308287415.pdfIn PDF document text
    • https://sambelteri.com/contents//files/xogagaxividemebokef.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/54868254818.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/mujawisonaxa.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/43829502582.pdfIn PDF document text
    • http://lagrupacio.cat/file/jidovekonawe.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4be35a737af389a075ee2b74ed787fdc/99237097723.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b044cd61---nezinuzopi.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/29810831852.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/tofufulolojixuredosuzi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/69163240152.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/26155850288.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/2626129900.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/44472815686.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/lupunavubogadom.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081318a5b39d---41294363887.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a4bd4fccb9dc2be3bb084443b1ae92b4/88617077341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+daily+4+digitPDF 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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10188 bytes
SHA-256: 61d86416cc04e8fb916ddb05bf039bf3d5ef5fc987d486dd3044e7d86cdf07da
font_02_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 18236 bytes
SHA-256: 2b7c14d2c530307ce139b22392e5080f2406aeecdc2a1470c6177e98eba0b67c

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