Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffad211914e43f88…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 17:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e466ec8e4abcf64e5f2784a97eff5119 SHA-1: 9692057335e5cb982ea43646047a3c16962f61fd SHA-256: ffad211914e43f88cb33e51a5b4c7e883644e9c3f3f6301692461f8a3d412b05
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a link farm, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=lightroom+cc+all+unlocked+version PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139059dcb95d---wiwemenaz.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/butevabatusu.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/noferetifanavutirofewaw.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/lexokuzibojovet.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/59067131906.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/48021153855.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/toduramopelil.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/14043118229.pdfIn PDF document text
    • https://cicimanis.com/contents/files/9110913699.pdfIn PDF document text
    • http://szjg.hu/images/file/61921468862.pdfIn PDF document text
    • https://festacontinua.it/public/file/89975593255.pdfIn PDF document text
    • http://lagrupacio.cat/file/powom.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/gebetugoxexijofetedikawu.pdfIn PDF document text
    • http://373113.linker.tw/files/88142474065.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ihi74kocpb7ptk3ne4his70ae2/31070542321.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4798b075c52078cd9f8976672d61cf66/88301448304.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/79391309818.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/zinelalinidilelixe.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/4100019556.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/96719469752.pdfIn PDF document text
    • http://dongphat.net/upload/files/somipaj.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/xifegirixamuvo.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/pulebalegufin.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/vasesoxepivegowajufal.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_off0000b6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 11032 bytes
SHA-256: db6d8bd994cec9c05bcfd80497f125a9d6f025d90dcaa6153817e5cd8b18ef68
font_02_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 17060 bytes
SHA-256: ccaebd9fc5ce275322e7a68bf74bdd57b51d27063b4325201dd6bbe8a267e4c7

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