Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d457a68274de308…

MALICIOUS

PDF

85.9 KB Created: 2021-09-25 12:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b5690d1eed4433ec13f1a0c60b6a5c0 SHA-1: 4fbb465f686f0f24f1afccde9228d8e2a25811c9 SHA-256: 0d457a68274de308a11929e75727decfaf63bb36236b2ae9521a3b5eecffb563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised or disposable hosting. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=android+telefona+video+indirme+program%C4%B1', suggest a lure to external content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=android+telefona+video+indirme+program%C4%B1 PDF link annotation
    • http://hongdacable.com/d/files/97357749581.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_0F6E510131A40DE2.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161458cdcadcc6---57294583264.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/30417232103.pdfIn PDF document text
    • http://electric-kernbichler.at/ligopokafevabu.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///10308517118.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/15233820874.pdfIn PDF document text
    • https://kaisar168.com/contents/files/mojipibolojel.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/47948886251.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/42076649182.pdfIn PDF document text
    • http://healthywithhart.com/res/file/22087663235.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ff5aa68cb84e8983e4f23d9bc1b1cb5e/43186679106.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3d5fd196738c17fedf174aa027b52172/weputalizupa.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/41123573467.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/73719899956.pdfIn PDF document text
    • http://saktigroup.in/uploads/vosovujojusunivovolisab.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417c282cf5---samigogavafu.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/74980847030.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/fuxizabule.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/xixutijasitojeko.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/80053429312.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/xadebujenivomorura.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210910092028.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1d3e034d2---papoleg.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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 18544 bytes
SHA-256: 5ef4a40588a2a98be9d9a3708cc0b0eb5d63f37a83278d83840c3502d27d1635
font_01_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 10768 bytes
SHA-256: 9bcd1dabc51c6d33b97c834f20094e25583738511be2a0664fe72b3b6ea2bb40

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