Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da54ec4aaded4eb…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 03:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 417b64360968e962a1ec23610098d32a SHA-1: e80fe9fa140ba4031e4f9eb719825de02494850e SHA-256: 7da54ec4aaded4ebc9cdd76be048e112789f0a97d7d8e785ac6f8926caca4307
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of a 'download button' heuristic further suggests a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://crewmak.ru/uplcv?utm_term=call+of+duty+strike+team+android+download PDF link annotation
    • http://go-pxl.com/uploads/files/96588718356.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/tevagaputunovogakuma.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/60555463105.pdfIn PDF document text
    • https://botroul.be/uploads/kedikazepetapuzab.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fd61d1ef---82987667772.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/gawotedawitinebuninixo.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/tufamurikabifabekex.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b14a3e7727f40fc7875975987351151d/10404814371.pdfIn PDF document text
    • https://casaalu.com/luutru/files/96905790411.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/59453387379.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/tubopa.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16143d5482de53---deperomofinowofufegubi.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pukepunin.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/kedafivatage.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4d2e4bdc26bba601a76ed5575b987d0c/menemunewituvevirenipimi.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/9546344844.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/50308864874.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/virezogodenijaxu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c272d85627---25857990742.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/wivukazubavamovozo.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911092449.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/viwomiliwufosole.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613887e6cced7---58632920347.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/soxoduxezunuzosa.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/74120441676.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210916162303622.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/lutej.pdfIn PDF document text
    • 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_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 10936 bytes
SHA-256: 8917e9512807f2e5972e05c7b9e056e76c40683a2ba15285aec659f004e0d639
font_02_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 17360 bytes
SHA-256: f1da36ee4b8b27ab5a502179d307575b8b7addb3c2eb43e672ada7af69e53104

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