Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ce24867cd6c9a5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 11:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 020f55fb3c6946cc1190df9081012038 SHA-1: 8d058a36f77a3fbc9067746d9b69e1423f53c1cf SHA-256: e7ce24867cd6c9a5c737d744552d3505d3094fbb6034dbdf26894d3d33f76627
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dyglas.com/userData/board/file/25031675237.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/25328874458.pdf
    • https://butagallery.com/userfiles/files/45611416958.pdf
    • http://captainkillmite.com/uploads/files/202109172154447428.pdf
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/gejopelobofonubeg.pdf
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/wibogetikigevuzog.pdf
    • http://epilia.com/upload/FCKEditorfile/ketatenawajazijez.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zinutu.pdf
    • http://2222.netsociality.com/upload/files/46996718901.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/61166748746.pdf
    • http://gocreate.termall.pl/upload/fck/file/rotalisefodevofelebabi.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef525631e7---10739946292.pdf
    • https://gianlucabruno.it/dati/upload/file/21470211993.pdf
    • http://artetendasud.it/userfiles/files/mizazelup.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/gekutanajibujar.pdf
    • http://szwygs.com/upload/tobelowomifaw.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f861693f3---xivum.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/50006911286.pdf
    • http://doremimarlikinsaat.com/userfiles/file/34793445188.pdf
    • http://camel-republic.com/media/userfiles/files/pewekofemejimob.pdf
    • https://casabresciani.it/uploads/file/kexote.pdf
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906145456.pdf
    • http://vom-ragnaroek.de/uploads/file/84057010466.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/2gnvd47a6kdojvpgmgp2nfsa99/87760869516.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8abd32f9c---zovabujuvifizugimigikog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+sms+read
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b18d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB18D 16792 bytes
font_01_sfnt_off0000c9a4.bin
99ec3fc3cd99401d6d7deef3967da2dea128bc348085e7831c421e1f88c4b94a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 10248 bytes
font_02_sfnt_off0000e09c.bin
a957a0cce7e2641225f91cdce9bc6822c8f8145c1ec1d51a077b6d2a77fab331
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 15408 bytes