Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06adee80d705e74…

MALICIOUS

PDF

71.2 KB Created: 2021-09-22 11:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4fa43609b30e8ca35b52a102e707a160 SHA-1: fe00badc680a3e42372db1eb308699f40a3086cc SHA-256: a06adee80d705e749bbac2d51155424515037cd7b749ead34cbdc6b4a9460bdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final destination. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent, likely to lure users into downloading malware or visiting phishing sites. No scripts were extracted, but the structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xafupojo.pdf In PDF document text
    • http://skkl.cn/filespath/files/20210902125150.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/jelegabel.pdfIn PDF document text
    • https://fasleh.net/Files/files/47136032237.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/rasoka.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/pukonuropuserogewud.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/buxixexodetewikolabulu.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/83041579433.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05117a99f---51502728309.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161427a4852b4c---59769011968.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/xewiranovuxar.pdfIn PDF document text
    • https://austarpharma.com/upload/files/rivapimaweduk.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/17965796481.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210919_E8F22B50B77A9AEC.pdfIn PDF document text
    • https://e-room.co/userfiles/file/tatibunevufitujuraz.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/60346955050.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7c208be6---kolovivupumigatibelerelaj.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-15/20210915225957733664.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/81528108797.pdfIn PDF document text
    • https://adium.ru/userfiles/file/vepiwekawojowudaxafef.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/jipelo.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/rikorasevixinisadita.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/53734804898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+download+pubg+kr+version+apkPDF 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_off0000b4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4ED 16036 bytes
SHA-256: d4899dbd8dafb03fab60a005e583fc733e0818e82cc17a95ea6817298bdac33d
font_01_sfnt_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 10928 bytes
SHA-256: 6a142ead72df601becb1e625b29f6b2d8f9e824eebf08dcdd2b0a0061893d1ab

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