Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b1d680e9999e33…

MALICIOUS

PDF

95.6 KB Created: 2021-08-13 23:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84c41654fbf9f32c72de8bce4955d881 SHA-1: df83d232215ea3098b01ea08a196db7f22d6aa45 SHA-256: f1b1d680e9999e3394e54c4c1bd8fcb7557e231acacf5a5ddc7495d607462b92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://krisoc.ru/uplcv?utm_term=nec+hazardous+area+classification+chart+pdf PDF link annotation
    • https://caribemed.com/userfiles/file/zogutozezodutakebesajup.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/tudubidebumadi.pdfIn PDF document text
    • http://vina2002.com/uploads/files/18175737588.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/43744204855.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b443a1db8f08adf3fab738b30e7f516e/94490932294.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/smpf1l22uvop4q6196oritq5r2/razifutibewiwakara.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083a75205f3d---tewirefiwirolekowesaw.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/33285650232.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/megabofosonefub.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/viridupujevibixabujufo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5cd6alrfffrs4iipg31miot5up/genido.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/ronufikefidibokux.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/lowibizudimokugewoneme.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/gebinozekozox.pdfIn PDF document text
    • https://petala.gr/userfiles/file/tuzufepe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4152ac3c---1961540905.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/12183143993.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/af82c64c3bf3e12deb60feada484bf40/woxowozivalivegiwiru.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/silezotupo.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/98837166473.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8d782907e---nivulikofo.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/40418594611.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/295fc72efc3b854f50402eed03e9b885/zubegekejovexolebes.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bfcd0b885---2383094357.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_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 17204 bytes
SHA-256: ae422923d447e69ab55b28fc40b32cef4268c1ba6d2d05b771e024499a77e9af
font_01_sfnt_off00013f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F47 10852 bytes
SHA-256: c84b3de47ea462434feafbdc2a6e7529560c299e1468667b39da937ed13a6ef7
font_02_sfnt_off00015851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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