Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29662b432a8b2b2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-24 01:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c769d67dc0dba370c52d9c16de0d766 SHA-1: 2c2c6ee97be2bb3149bf3488f4080d396b6a3d32 SHA-256: f29662b432a8b2b216557a72c21974eb688954c778ec2e05f037c9e95f8b6ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=icarefone+whatsapp+transfer+review PDF link annotation
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fdddk8bipjns5ecqqgg199iud/gazazexuwax.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/49414273145.pdfIn PDF document text
    • http://vaithun.net/upload/files/26699954760.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/32531299526.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148863f55f7a---64701033200.pdfIn PDF document text
    • https://zzwgjx.com/d/files/71960926680.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/40161373539.pdfIn PDF document text
    • http://bibikid.ru/upload/51498319440.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/zipud.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3i357bjemn6vmvbho6huj9ur10/fewunewevopeku.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/wunalisezixarezibo.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/lujobaduxugadanopesopobew.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/norovunojojupulunuxebi.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/gilopuraxejel.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/58446144132.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/regesejafup.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/semepap.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/39722555005.pdfIn PDF document text
    • http://xn--42ci4cc0aric4a6dd7c5af9nef7sg.com/userfiles/files/56650437766.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/28762261708.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/bevisenul.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/kudas.pdfIn PDF document text
    • https://tonitomov.com/picture/file/zofumosufet.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/60497260296.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/80616455384.pdfIn PDF document text
    • https://afraitn.com/basefile/afra/files/ripujanezarifatolix.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_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 17964 bytes
SHA-256: a4bf14a034feefbf8e21500cb7c782b8c43eeb8927259fa8df0b04666d6d1a07
font_02_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 10632 bytes
SHA-256: 7934af6ee34180e3a7e9a70dd0df4bee97515f68293943cc5fa2061329b83b67