Malicious PDF — malware analysis report

Static analysis result for SHA-256 379f443428900e1a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-26 22:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 116be70dd15fc66933bd74302c347196 SHA-1: 36d342ba40cac52319598443557e349b41ec0bc4 SHA-256: 379f443428900e1accb93dc528c6f45fc0028c4973ffcbb7914de9440ad31440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=list+of+biggest+economies PDF link annotation
    • http://chemonova.com/FCKeditor/file/5566497001.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/tugibijanil.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/19145562034.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/67132156136.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109232117228719.pdfIn PDF document text
    • http://anpo.vn/upload/files/fipokoteraketuwekerejajo.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613763217e207.pdfIn PDF document text
    • http://apismorava.eu/docs/39362072043.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/78108077545.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/niradixesiwujukapugolef.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vobatuwomokabexepelo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614daccc9066c---gixozawobipupuzu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614972a914969---32058757443.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e252f41052---17513199593.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/liluda.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/zexosojupuwax.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/324525983.pdfIn PDF document text
    • https://serka.com/serka/upload/files/kexiwizusu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faaad2fcba---kogufiluvuxaluxisojinobop.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/tiwifuwose.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-14/20210914063441245508.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/rurazafir.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/17469099327.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16147c22e0f789---batukuserakemikemuj.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/fipuzibevinogefozo.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/80414391966.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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 10468 bytes
SHA-256: 8b917618db78e5c15271c6c7b44333ae3dadf3bcca59e258ccc8d46c499912b6
font_02_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 21364 bytes
SHA-256: f17c4413bcc237ec7ed2c93d6f0791ca4e2a7261afaed80559e3fa0ba1a17c19

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