Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f2b0f934eb671e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 04:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7011890b88e1f206aaf7fb936e3222f8 SHA-1: 3b8ea96e7de7ad27da1998de5f9e7adbd7afcd58 SHA-256: 94f2b0f934eb671eec4aa61fe76b76e128f2d536c545bec4a9462e8964636730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a link farm pointing to compromised WordPress sites, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc07164e46---1611492635.pdf In PDF document text
    • https://mimpidia2.com/contents/files/xapafixezoviperuvaruneto.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/7626739091.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7983329d---81765301896.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/dapumof.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/rajozi.pdfIn PDF document text
    • https://777mto.com/contents/files/gaguxaduzoxilimazenawi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23a256470---lekavuludibibozerabopo.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/84943400611.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/beboxafer.pdfIn PDF document text
    • http://strahyi.ru/images/file/75829698195.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/56616477243.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/wagopapowajegigon.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/51200246543.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/gesogeborazapukabaf.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/61596881819.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/f1lrrkf927b89v9581t05rpj1a/nusevetuwil.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/69822368853.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/rabozuviwepavavesajusoz.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/dubegi.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/6641624775.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/sixijej.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/67750271560.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161384fe3e8869---5153447887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+get+iphone+messages+on+my+androidPDF 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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 17584 bytes
SHA-256: f3727bb3ee00e3f1105262c56b0c7ea921bd08c9064925382f8a761e07f2e6ec
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10984 bytes
SHA-256: b490dc630127bf900504e4509b6cfd7f4d47982652d1f20857b45b479a1231ff
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1