Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc441bfcff17a3e8…

MALICIOUS

PDF

139.8 KB Created: 2021-08-02 05:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4016a7c0520fbdfa4c1991c511d3ec94 SHA-1: 995b9777bc06ef2ced14716e6a2b259f03123707 SHA-256: dc441bfcff17a3e80a67c443d6c6129dc57d0e7ac7ae2eb59d02f77f9aed62e3
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document exhibits multiple lures designed to trick the user into enabling content or downloading a payload. The presence of remote support tool lures and general download buttons, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. Although no scripts were directly extracted, the document's structure and heuristic firings suggest it is designed to facilitate the download and execution of a second-stage malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff792b3d8---25330707244.pdf In PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/65579000464.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gaufb1uioni1se3mqos7g283hp/34066879416.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/49686496742.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a4086a5f775---wigaduxidufimevax.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/vawukesugevujogudukipo.pdfIn PDF document text
    • http://azizolace.cz/images/file/737097725.pdfIn PDF document text
    • http://stasta.com/userfiles/file/49213163619.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cc04251ce2c---51465087940.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d5bcb334f---jubanaduvalafofe.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9887d4615343c1ba7793e2958ea6e847/31472342383.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e2ab4b95b---tudovuzez.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6c95feebc5a874bf5536133359901d8c/wibineweka.pdfIn PDF document text
    • http://chamdure.com/DATA/files/wixilamamumerexazaxiwe.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f880a5877---80276148412.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9pedtaajnavhsfa54i563taq6s/kiwukebelojet.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/lawor.pdfIn PDF document text
    • http://health-bridge.in/upload/file/18854122171.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae6neuh4chnn18s7tnc097iqpl/71259624300.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/3348087951.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/30365469206.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092501fb56ca---37082163115.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6b75a13b---17741360977.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e5seklrjp3ojmkq0oa884mgjc5/lorutuzetatopotokazar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ccs+c+compiler+crack+full+versionPDF 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_off0001bea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6B2 18472 bytes
SHA-256: 2a91fcc3857533efe4889467005531a2809a7fbaad6f83d0f306c7a41fca36eb
font_02_sfnt_off000207d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207D2 10832 bytes
SHA-256: 93bb1161041fdeb6c11317e094e48c216e61ff97e94e4952161815592c8b823d

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