Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c17b9d03455563…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 18:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92da4c74d2b73f9d8674ba74cf92f21f SHA-1: 2231797ff3d0bc5041afed227846078ded3818bc SHA-256: 04c17b9d0345556350446dbcf57c8f716c0aa5673eaa15fac9476f1930b4c77a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple suspicious URLs strongly suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://paradigma.bg/uf/file/xanoputujesewujelaram.pdf In PDF document text
    • http://stellarp.com/userfiles/files/nuvulu.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/xabekik.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/73376302300.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/demotefenubogofew.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191441165846.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/56174319142.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/79118532715.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/89553298958.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613060ff2a671---78938074498.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139d38a4e1b2---96249707169.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/dozexofusixakazet.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/mosekavovawerupapovojurek.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/79292667808.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/renuwawomotaresetakus.pdfIn PDF document text
    • https://eklyps.net/images/file/punisizoralagajabimilop.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf09c8b7f---13222973150.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/76622812826.pdfIn PDF document text
    • http://ropesadventure.com/d/files/56006636350.pdfIn PDF document text
    • http://w-mill.jp/images/file/jifurawokoj.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091321749_852597287.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/majiguwijedigejodawa.pdfIn PDF document text
    • https://codecs.ro/images/file/rojufiromi.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/jegaxejul.pdfIn PDF document text
    • http://giga.sk/storage/file/11283633466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tv+online+pe+androidPDF 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_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 10148 bytes
SHA-256: d0477e0fcf5851743c8bdf1c024f6d1fd5f6c66212b314d81bb18a7b58cd06bf
font_02_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 17160 bytes
SHA-256: 47fdee2f48b9fe2851cb2a71cbf03c4a0a8f3eca708a88388c6182869f7dca6d

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