Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd491dfd80785936…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 15:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd9484901462a28a32c4ab4afc212569 SHA-1: a38c7a35499c360aea365a3953126baacf836459 SHA-256: fd491dfd807859362b2acf3347799ba987988a1146d014276167e885ec1411b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is flagged as a link farm hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through the embedded links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://pistant.ru/uplcv?utm_term=spider+stickman+hero+mod+apk PDF link annotation
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614514ee53c7a---patefezawaloxepanilanu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64abba35439d441e25fcfee6ec316fee/83785374811.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/kutinirajogumiziwodilake.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/96869995056.pdfIn PDF document text
    • http://indemo.pl/Image/files/41619478726.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133df0a47758---nodofefur.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912174945605942.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/visaviduditotewuputawadix.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/falabuw.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/2282038840.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/13154914608.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161428f3e1587a---88992246826.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/143941686661458371c552d.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/fobixemurukijenam.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/wunadowuzewikodaxubola.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/nolob.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/robujobavexuxal.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/12922178198.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/76701794494.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/fatexezanexemoluf.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/12761201431.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/fosuzodakepusax.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/pomesi.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/nasuguw.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/rimikena.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613851f55ff71---wegavizatuwimibazesojosa.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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 15028 bytes
SHA-256: 1dc015a1eeb85812e5c2a31bc657f080112e5ad01085169033ece1ec1ef20298
font_01_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 10900 bytes
SHA-256: 02fe04dfa88750cfca5bcdc52d2d9485f92fc5f7fe9e27d968d84525e99c979c
font_02_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1