Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13da441da5ac8a2…

MALICIOUS

PDF

75.0 KB Created: 2021-09-23 13:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6264bf4c7714388acb09de9f6075f299 SHA-1: 7859108e5826f53f6d4c278026fde87e9be2a269 SHA-256: d13da441da5ac8a295d22d118e31b6f2d429fa18fe1da5f897656a36ad5adfe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=how+transfer+file+from+mobile+to+pc PDF link annotation
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e62858113---21011328675.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a4c5c3d66aa69bfd8aaa872ef0a1e6a4/zafuj.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210923012858.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/65829556454.pdfIn PDF document text
    • https://foulardfotografando.it/file/wesunezeri.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/sujubiditanoneneludo.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/godonu.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/84736124212.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/jinev.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613356267d735---pekuzujaxekarejofogin.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/japisakamenax.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/81774563470.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/xefibitejuroxakovekeji.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8188e4073801653d86585de1130279dd/nepusisirurijaw.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/wuguseledusuniwil.pdfIn PDF document text
    • https://produse-zilan.ro/files/94579769996.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/12023695463.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/bezojexetagumibejoxaxegek.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/somukuwibi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zuvofivadezonoxowixeb.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/89323066714.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/84289447472.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/labunutunuke.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/11144904111.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_off0000c13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13F 10860 bytes
SHA-256: e34085765150249492c3185872f5038d598fbd90366fd89007c281bb740162fc
font_01_sfnt_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 17144 bytes
SHA-256: fa80001ef9e148ce95e428e6df6968a2ddb63103e2105bf1a07e559acf086644
font_02_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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