Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f14a26a09c11850…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 08:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c12e2dbc14644b2eb531b9f42b6b585 SHA-1: 0efe93d76fe8a61cb769e597bcc08c0c5fe4935a SHA-256: 1f14a26a09c11850141b189dec28224c68636fda47536beff270d23fe8417935
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a link farm on compromised CMS uploads and a lure for password-protected archives. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to trick users into downloading a payload, likely disguised as an archive requiring a password.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://klhl.com/userfiles/file/17804870558.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mtmqrdpt71ho4oa6sfkup9jdu0/notonojubozoxat.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/9520216191.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/22549320288.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4fb415ee5---demuxerisemofonojofox.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbaf89ddc---65836205259.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/54289061599.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/4101903120.pdfIn PDF document text
    • http://mobitransjogja.com/files/9626136641.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/wojagexojep.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/nawogofat.pdfIn PDF document text
    • https://ms02bet.net/contents/files/gugerulejuzepe.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/12850380946.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/gunesivuxojojawumigu.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/diribelovene.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/22198725908.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/63275134114.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/dosunuju.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/pamulinekokaxogomekib.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/bunorupawozotelovo.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/9229983010.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202197057475046.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/72354034113.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/bafufojurowesotibotikut.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/82803996137.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/99434604342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+rar+extractor+for+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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10492 bytes
SHA-256: 85bd79e8238b32a0202aaa72170f5b5d88247672c5d812e13a6011dea16180e2
font_01_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 17744 bytes
SHA-256: 4c8a0f0bd64df15707242394f0ccb8e36c0044da8594639caeda8bb5e8e050e3

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