Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cde91c9f2075579…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 20:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bf43907106231ba1f6f6103c173a0ae4 SHA-1: 9c2f052b3d05c64d5390cbd38cc5a189ce77d32a SHA-256: 1cde91c9f2075579d4f0417abc3654aae827525653655e87db81c57be527b83b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of `utm_term` parameters in some URLs indicates a potential SEO-based lure to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=spongebob+psp+iso+free+download PDF link annotation
    • http://katachizu.com/img/news/files/29329651560.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/98353715346.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/72122818389.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/3828057815.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/7122826467.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/gufozugaxuwerolebezox.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/guxusujexonuzikixaforo.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/rajedisunowogi.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/bixuzaf.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/60662225474.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/62196993051.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/83194501108.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27d3dc96a1a9d7d85ac80a2cb27b3018/fagunaseba.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/lejekokiforoneseza.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145011ca3d84---bawiwir.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/40514853272.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354bd7ae197---74565926568.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/jofomez.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109120825566965.pdfIn PDF document text
    • http://elsped.hu/files/file/nobibiwarirenimibagogipug.pdfIn PDF document text
    • http://remobudostol.pl/pliki/51832578654.pdfIn PDF document text
    • https://koratspring.com/upload/file/polipike.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/691b6c0936698ccded9b98769453056b/wipusasete.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_off0000b001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 10876 bytes
SHA-256: 189a888c6265d3b9fec30489501f93c2cd99b77c992fd234785a4f225ecaa0e6
font_01_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 16104 bytes
SHA-256: 5168a44c493c20986f9484d15ee04ef03b801681e5803a49403cc505f05ce1b0