Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f40a4fc78b5c84…

MALICIOUS

PDF

75.6 KB Created: 2021-09-25 17:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 56f35d1ab800a9769788f5596143a5e9 SHA-1: eb2e682db0b2e7e394db285b97d97e1173b253e5 SHA-256: e6f40a4fc78b5c84fd91412694afa83f24afdfcb510832cede873a613626cbc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=david+foster+wallace+la+broma+infinita+pdf PDF link annotation
    • http://petraifevronii.ru/ckfinder/userfiles/files/guwififonaxuzonan.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0a19b1e70---49981131915.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/89eeffbd8e2dd90de33af812a9847cc5/79585957130.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/lojekujifo.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/retifutofu.pdfIn PDF document text
    • http://tecksco.com/upload/files/mogagobobekefipogedowa.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/lefawirexud.pdfIn PDF document text
    • http://hotechike.com/files/files/92197336331.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/xudopijumunavujenox.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109081534343103.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fe30b02be3257942e04c3ad54622f8ab/7636703359.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0d9c3a2282cf526dad02e7442a415d04/50336793609.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/67687201808.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/8235440883.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/bifanikotudatefiw.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/91646258802.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614889d654c1d---bupisisabipabilataxizex.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109020803344136.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630493241/files/gupidofenagajufiwazejeziv.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/36795604948.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/nobirevorobu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nvc0k15abkv5o938pnglbi53oe/vuwijipufodewiwi.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/jirotiwamaxuwodajer.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_off0000bdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC3 11076 bytes
SHA-256: d98604c6e37ada8c24f3056660439a3cdbd3a85a902c2c8790336d85ab696152
font_01_sfnt_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 18900 bytes
SHA-256: 654f933fdf5c92f35d9e40dfcc316fcbab619d230288d8f84259b89bfd6859bf