Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0433b1dd873610…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 17:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9fdd52f73ee25bb7b8e56221f354cd7 SHA-1: 8441194b7162736d84baad3ae7668a8134b5a8f1 SHA-256: 1b0433b1dd87361013dd3eca1d356ba6910ff7920dc2f1e7e6cbce721fa8a98b
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. Numerous heuristics identified the PDF as a link farm pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=watch+grounded+for+life+online+free PDF link annotation
    • http://www.lbtfilm.com/uploads/files/93511080530.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4b4e5741c6e203c9cbd93d845de57f96/32326149389.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210916155538.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/witanojo.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/43012315986.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19ce2397a---17219829974.pdfIn PDF document text
    • http://uchid.com/uploads/file/babulumebuzira.pdfIn PDF document text
    • https://activepymes.com/pub/file/75253272084.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17be11287---ropigazozenide.pdfIn PDF document text
    • http://dsagco.com/Upload/file/jazazu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gakfihhihv265cgqkkhb8lihmd/figikovagalofamuxanujux.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161408b6742f63---bakenut.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cdaa2e911362282c2b9f75d471f76f45/demoxiregaku.pdfIn PDF document text
    • http://webbuilders.com/files/file/begeguluraxepowegazelix.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/92656329012.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/36821078002.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/fukojawuwulokigole.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f4738b89f3d92390a30f5dd61c016692/68022420887.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409600c2e62---13049733392.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/sarovudemupof.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423b0f63b88---minisubarebulaviv.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/33482975262.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipokomixemazujonoraf.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_off0000b95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 16352 bytes
SHA-256: f3be4473c2a582469aadb6d8f28a27fc2755eefb924f2a1b1200b78999850b18
font_02_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 10680 bytes
SHA-256: f2432d38495be33e8e47638bd45b7f67d2e8ffcb96684c44c588f76d39858176

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