Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7d5f0dede44fb0…

MALICIOUS

PDF

108.5 KB Created: 2021-09-05 02:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40dac864258e1eadd3d2b727caa8ce70 SHA-1: 1977a7bb1bd04de411c48243ca37118d5cd78c99 SHA-256: 8d7d5f0dede44fb0c65122c5a3fcee9083d0c9789c31ee5b3572d89331630c44
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://bfr-bialapodlaska.pl/userfiles/file/888676669.pdf In PDF document text
    • https://kasihpaham.com/contents//files/febimigorilo.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/dobefefozesewivugetugi.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/47494833481.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210805102403.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd22289760---98185253377.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/7hjogun6dst0v6nk1v2bk707l7/22024682940.pdfIn PDF document text
    • http://vlajamo.cz/images/file/torevatunupumekinefipup.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6c68181838da21d2590c579d32f4a807/mibakiri.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/sexigixabokivawub.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/56256205575.pdfIn PDF document text
    • http://clingac.es/d/files/duluromukebamelidagor.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/revesimepijirufudizew.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3828fdfd1e---25061791883.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd85679c01cb33ac9945636ee3e9cb07/wevukakuxot.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lakbtgifm09c1rq62t0901jpv0/noxuximawazitagululawa.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/18788242196.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/doloxefoza.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/nigebofelig.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63784192127.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/mijesor.pdfIn PDF document text
    • http://vbs.pl/dat//file/pofivu.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/20519987794.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/vadurevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cd+action+2005+pdfPDF 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_off00013bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 20976 bytes
SHA-256: 6b76b7c26cfe411aa01a28d5fa08f63a4a1d9bb0d5e780956c900a41db71baa3
font_01_sfnt_off0001729e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AB5 10572 bytes
SHA-256: c30d24a9a397f04d98b9ccdafdcb9b747912e40357c5dfdc582c1b4a69b635c0

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