Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed9ccb0f978c4c9…

MALICIOUS

PDF

87.4 KB Created: 2021-09-15 10:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09dcc1264468915ac57d507dc0c2d9ad SHA-1: 0de568179b5d7b78ee7e2832150cfd7879c7e272 SHA-256: 4ed9ccb0f978c4c9dd60f14fa5abb89414e7edaf71cc7e889c2f97cad08e451f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The document body is unreadable, but the presence of numerous external URLs and the 'QR code lure' heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ciar.vn/uploads/image/files/vinor.pdf In PDF document text
    • http://studiodabo.eu/userfiles/files/torod.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/12296784843.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/30718927765.pdfIn PDF document text
    • http://dsagco.com/Upload/file/94005742444.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/sixijej.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/10197963999.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109102245124893.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f74048ce5---nelosepumuwoxo.pdfIn PDF document text
    • http://infunplastic.com/d/files/wowenuzavogosiwesulidive.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d600bf9e---sewobinujezafafijidupo.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xisotemik.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/gefetalud.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/juzaboxexabibidageweju.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/71917600943.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/75264160844.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zitilikilaminukinugu.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/7323119759.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/55893179845.pdfIn PDF document text
    • https://basisnomor.com/contents/files/femovisazulogegoxesinazes.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/9543586649.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/31627420890.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/17546608139.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/razofuxazamebenut.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/52605352288.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae2ada735---kuneximigadoburuliwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=qr+droid+private+iphonePDF 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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10400 bytes
SHA-256: 53d266080edc52647ad9d15524cb7a0724bca5846beb6673ed81aeb4c62af08b
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 19212 bytes
SHA-256: 67cded3af50fe38e1f77dfe6a86c026bb5def84211c97ad374937cb19cb3c8af
font_02_sfnt_off00013881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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