Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd45be9160c45771…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 09:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ff4d2d91d1c4e0e6929beda3169cb2b SHA-1: 589241e9d8b0a3a74582e3aa7794f7ad0af55c91 SHA-256: cd45be9160c45771556db42468a1c8fbde1c4a2a1549b24396b9ff179fb4dc5c
164 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, and the document body was unreadable, limiting the ability to determine the exact payload or exploit used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://devison-matras.com/upload/file/gemovulosewizerob.pdf In PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/53a478202744b971d7c1fb5783679edb/kapolarerosifuwobunabi.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/dakutunow.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/javafuj.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e028d3157---zutewanosodezetaruliz.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/67678271359.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ae92881c---14552791400.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac306ea40---dalezudumolox.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/fapor.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/486333075.pdfIn PDF document text
    • http://jcaf.or.kr/ckfinder/userfiles/files/gofano.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/muwegob.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/9873420462.pdfIn PDF document text
    • http://dentherapia.hu/files/file/41606595040.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/3985389119.pdfIn PDF document text
    • http://mousike.it/img_ins/files/57725037814.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/64829124710.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155f6b022e---64548013935.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1e6d54f6555be3c0aa153fcb815d4a46/20086734426.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/kurapijazawovij.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210625_224748_7055.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da77efce4---85561702981.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/17060607634.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae4b93492---gosozege.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8253c6f3---48909815679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=numeracy+worksheets+for+year+1PDF 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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10780 bytes
SHA-256: 553a48c4a027f2862aeac59f5c2e32016d225b3c667e4112265bb868ac44f52d
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 18412 bytes
SHA-256: eacd8705935ff30e736e236ef93e657aafeac27d9ac16ad31bc40caf299a8d70
font_02_sfnt_off00013134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1