Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f778ca7e931387…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 00:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8affb98cae2a873f110db0292926432 SHA-1: 631b34b9b8f726b26c47453de03c792daeec097e SHA-256: 33f778ca7e931387ec31e351cd33e7b6749f7c0d792de4fcc431ebf8774ded8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=divisibility+rule+of+2+to+12 PDF link annotation
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2aa48362c---73397305504.pdfIn PDF document text
    • http://minipit.com/data/files/34216723817.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/44237887612.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/76669793588.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210608050654.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4e87498b---55932353122.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/kozuripewej.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/tutevomuk.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/zitapinatokikotexizufos.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/loterumexawu.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/13677339557.pdfIn PDF document text
    • http://domainecomps.com/documents/files/78227532725.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db172635b177f6f744fd669e51fd8c2c/zedavinoxuxinopogezidirug.pdfIn PDF document text
    • https://agermag.ro/mm/file/pafapatukufabudolibosul.pdfIn PDF document text
    • https://afayl.com/userfiles/file/kesekofovefawokim.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gilotilere.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2fba67e5---43530147356.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/denejaxun.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/12903064945.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/kipix.pdfIn PDF document text
    • https://airshow-bg.com/file/jeferepexavuf.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052307424273499.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/de260be2cbd1e5b0568b599e3be9f834/62326116500.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8d059598e48a0e0e875eb850612131e5/1986317930.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0ch6fch72crgefjccarsmi0m91/34576445211.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_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 18308 bytes
SHA-256: 874bffc9940ff0952774569f21f914cd304b4327a04b9375bbc51990c53bbb2f
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 10532 bytes
SHA-256: 5433e44997910da1e6ab1428a8eeffe9f22fda363e57dbd259f1e6508604c1a0

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