Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8e237a07144984…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 05:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf01c14e140d7325ef63bca8f88ebe30 SHA-1: 4bce14b876b6e4f477a07d50b9a8ad670631819d SHA-256: 8d8e237a0714498463826bcca66e5794950cd16621a49c0c395eca89586ff63a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, some of which are associated with WordPress upload storage. The presence of external URIs and a link farm structure suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://htk2.altrodesign.eu/ckfinder/userfiles/files/22064054299.pdf In PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/31097765464.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/50707915410.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/64236062462.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc899fbd7---24973685142.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/dipajutazaniba.pdfIn PDF document text
    • http://mqskin.com/luutru/files/vobokipiredodasa.pdfIn PDF document text
    • https://carlojans.com/cms/file/xumexotemukamoru.pdfIn PDF document text
    • http://hexindechem.com/upload/files/75342879710.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ps9c848lm06ahpefe6c4iamoel/71410481889.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/29382716228.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40475499069.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/katavututadutukodates.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/lomabesisubezoja.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/baduxedodozijowabibija.pdfIn PDF document text
    • http://sgpeo.pl/users/file/kexegaluxuzudovebozafaki.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0a6571d39e92dfdb8d82480ed08481cb/posimimob.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/db705be2c7ae1d4a2fd7ad7e6eff71b8/52060650263.pdfIn PDF document text
    • http://ailizia.com/userfiles/30266751364.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/mowigalazetaxizob.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907071400.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9c14d543---jakigewaki.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/lididozun.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/23501261823.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/77652331395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=snaptube+apk+filePDF 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_off0000d62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62A 10372 bytes
SHA-256: d51143639b3844914af3ae91808b7a988b7b423964076afdda2980aef1fd5c67
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 18200 bytes
SHA-256: a42e36d1939d28f180f974f9973ba11938514b9fb5dfdbb4a5e4320649b4a59a

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