Malicious PDF — malware analysis report

Static analysis result for SHA-256 7436c79c94972521…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 21:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17351734add0cbabd10e9a2b91c3c131 SHA-1: 9a71c23597fbf6b87989ec62e2b7fa5bd52c72f8 SHA-256: 7436c79c94972521a186ec32ecdad2895ff82530690fdd8ab8485972f1acde6e
164 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://winpoasia.com/ckfinder/userfiles/files/95978724231.pdf In PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210911_A3C4FC0149771A44.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/68211694280.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/famatulovusinabupan.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/ximubanemo.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/62465230282.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/33071479326.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/16837043370.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139426a4098a---47347652434.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/zabogigemamevakoxemag.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/54115359311.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161409691b20af---tigigidoxemowijupizux.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbbe4f277---10471801723.pdfIn PDF document text
    • http://klhl.com/userfiles/file/vozoti.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141667f6f3a9---jarovedarefi.pdfIn PDF document text
    • http://gnox.vn/upload/files/xuwudoxizaxisevuluvodivem.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/63481937078.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/xomiveguka.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/5055991441.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/45768859108.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/90454025709.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/46396297920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sinhala+movies+downloadPDF 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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 10540 bytes
SHA-256: 9c4d32b60073581466656a47c1faf3c10da6373cbe8aa956af1a12c110541a8f
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 17724 bytes
SHA-256: ccb1ba5015fd575c70196f635dd810e4353804e82db47703140cc4d60f361e2b

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