Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e75b6bffc9cbd2d…

MALICIOUS

PDF

77.8 KB Created: 2021-08-16 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c675c3779db73b46461c7a791bcd107 SHA-1: 854d0e9a95ba5399c628786fb2c02581a87e845c SHA-256: 7e75b6bffc9cbd2d758da717754b6422c43533b7bbd8e739da9bedff898c2648
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download files from compromised CMS uploads and disposable hosting. The presence of a 'download button' lure further supports the phishing pretext. While no scripts were explicitly extracted, the overall structure and URL patterns suggest a phishing campaign designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec7940e4fa---85089105461.pdf In PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/78524728622.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/vojika.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/20506572547.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/56491158492.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e59f2273faef96b59c4ebf71bceb91e5/1823764829.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/1182509203.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/80636196358.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/49023070247.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/lizemirufanavekad.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/redepoxaninesagadilu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/69eb102cd0f836dbafcdd553c0ae0d55/79341016455.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5qnle4mcc0af9f6toie8ji1nno/fijibewosisibogitanak.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3280d3067---44733479941.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/kufazudo.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/liduzadapolodulames.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a1d15b568---deloxofodamipodijomeve.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/84039862076.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/rimap.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce33b1d0fcf---35778249042.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/xitilowi.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/dusufuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tamil+comprehension+passages+with+questions+for+grade+6PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/77945371754.pdfIn PDF document text
    • 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_off0000ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 16760 bytes
SHA-256: 5391608ad4800beee6ceadf288d4743d6f586122b6dc78d15bf769baa8b85fd5
font_01_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 11528 bytes
SHA-256: 713d78d96f16d5022ed06b12b6e3015cb1b95656c5b6f8f09f7bb6c4117bc650

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