Malicious PDF — malware analysis report

Static analysis result for SHA-256 8853d308307e4db1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 02:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9365c248b9e38169e8e41152e3d6fdfd SHA-1: 02398c2a854e68200aef80e208d9198da893b13b SHA-256: 8853d308307e4db1f52e40014699999655156598f9821db46ff08b2b675722e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161335be7da8d5---lafewisi.pdf In PDF document text
    • http://tnslib.su/userfiles/files/kupuzitadozebulugadonumok.pdfIn PDF document text
    • https://laser123.com/geektic/files/8089213899.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/b5isatgd058lv5183l3bg6c0re/36850784067.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/wevumavorove.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/4670873040.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/96216686234.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309a3125917---13316008194.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/begemizuf.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/dukujakikap.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021917550307518.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8577af2cc---dajanaxidesujasabu.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///69999921159.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/bixezuvokamotizij.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/kakoxuda.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/vifijanobesovetiwuxudi.pdfIn PDF document text
    • https://gdaniec.com/upload/files/tegobudatusit.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/kesawutonuzozuzezixira.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/q6ni3uvvr7cmjf2rskoopgqjfo/68056385273.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/42098400082.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/widisezunijoraxejod.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/68700158535.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614248a2e138d---33109891997.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/90008163425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=app+to+show+phone+screen+on+computerPDF 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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 18548 bytes
SHA-256: 5765f2e0252b006ca977ed3d07234a6801dff5777bb3de86d7f0a94a84c37c0f
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 10504 bytes
SHA-256: d9cb9c639c8d3c73355e86a74464fe7e5b4cedaa40e711344ac4ad66819aaa9a
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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