Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdba7517478c4fd…

MALICIOUS

PDF

111.7 KB Created: 2021-09-04 22:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8a5363f8d21ff2b6a589a325fb329d66 SHA-1: 4a78df322f4177e2a788780600b5d70dcc703852 SHA-256: 5bdba7517478c4fd320b9d5bcabea62a74298bb656450b7240ff1c6cc89e07cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous unknown reputation URLs reinforces the risk associated with accessing these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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 http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/66722838653.pdf In PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/46096948808.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/30633475411.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/60874215938.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/54874686080.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/15315819840.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1f7e7ea867377dbd153a24033e3225a2/ganin.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/h18343ca247vi0n973t17he1nq/jiturikeruxuv.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/fibafogexokajizor.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7f0ddbba---wimomojewidodurigata.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/xotegikezujilurume.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9pjpdfitqnefl3umrh63mrenh5/fojitopusavevinexatip.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/parigitopidutumez.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/46315521372.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pepitidexawukunoxikomuzuj.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/rulesibiletojetenigem.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/9718648519.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/60425088894.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/10409415907.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tamatinategusoma.pdfIn PDF document text
    • https://everestart.com/images/stories/file/4390695086.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/32816590456.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/jolubuf.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/88604124421.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/ludutobobobube.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dmpvfdfrrirm9ma3hl6uklgdsl/fibelapozedun.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1d28457709888f24da2166dc1ad3eca4/52993485849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=diffraction+grating+experiment+pdfPDF link annotation
    • 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_off000149a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000161b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B3 20860 bytes
SHA-256: fa0deeea8a23ef6640bf99100a91aab9071f6767bf090f4951bc702cfbebc2b1
font_02_sfnt_off000197e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197E0 10852 bytes
SHA-256: 71f867200f24c58631b718e795e610ccdb3b1439b0fe6d2c5e3d3c1a2e3a9718

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