Malicious PDF — malware analysis report

Static analysis result for SHA-256 707ac2aa983a4892…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 02:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0fac218fba4b2e232ca794cf061b267f SHA-1: d9a07ab8cca4b6a8e8495f4cfd9ce9b20c769957 SHA-256: 707ac2aa983a489240015f25cbced86b5731111300893461bcbbe1a302abae3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to external sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

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 http://xszhuhai.com/uploadfiles/files/61667402301.pdf In PDF document text
    • https://blv.by/upload/editor/files/94998789303.pdfIn PDF document text
    • http://fabtur.ru/upload/files/defen.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/95024670917.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///duseluve.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d2ee598d---20958100841.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/27881040827.pdfIn PDF document text
    • https://sambelteri.com/contents/files/nutovitodadudip.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/12750481611.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/kezikexexalatituzivuworag.pdfIn PDF document text
    • https://apra.pl/files/file/xopenanibove.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9abf75760d1c6a916d313955898e9a16/31130417859.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/tiwiwijusuvijosivifu.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/kekekemisifawikisixi.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/98421281254.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/25061477965.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65098770235.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141ca645b69c---23939994471.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/97699449715.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614096db971a5---33571154344.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/sagubabiwumekotazo.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021912233825885.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b4653d16f---bofesunokizog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=convert+pdf+to+rtf+online+freePDF 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_off0000bbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 10260 bytes
SHA-256: 0ab5a47dfa689818e4a52ca55af9b2cf19b5df769bab5b628dc2721106017822
font_02_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 15900 bytes
SHA-256: f03e48752115250ac2bebed4383e7ef6cc3c41b217473297d46b20b2335d7649

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