Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7bdca85d925cab…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 16:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4472f43bc72d3f590e34f4cbefb1206 SHA-1: 7629f6211acaf357e5901bd19b5c1edd8a4912b5 SHA-256: 4b7bdca85d925cab2d35db8c711d137799969dfa876ff00b4f88fe592aa60b97
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL findings strongly suggest the document's purpose is to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/13c1d8eadeb1e96d381b509ff1f28edb/nenunedodarogarefepew.pdf In PDF document text
    • http://kabinet.puzat.ru/marafon/uploads/files/wapadibadisopipa.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/65242907952.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/13761627014.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614833b8d94f8---lijevapaxo.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/61074945276.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/2905286015.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/49046382245.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7066c2918---23196480023.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/94911293527.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/zijizawidalufonepozufu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/57486186121.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/repagelikadisomusu.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/50253288077.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/jonokesisoriwo.pdfIn PDF document text
    • https://mashura.co/userfiles/files/38934080407.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/14437798332.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/mekikapefekax.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/tugopovodunuw.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/jorudugisavemojiwesi.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/zenavoseduvemomuzupiwupo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e3d2fc90e3cad25f42b09305c109f7f1/97472421035.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/xoxofiroditogurupateliji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=manual+de+brujeria+pdfPDF 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_off0000b701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 10468 bytes
SHA-256: 77f69133efda710492c521cda5f680e56c370552c7e132610a7d28c5cf6e2c1a
font_02_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 18192 bytes
SHA-256: f90a2f39a62859a5f97de7f630599008c4e239758a5bf0d064b48bd170f2ad1b

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