Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f942b709ea0a409…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 13:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0b209ae3d8e1ae5bc77e8679b6ef33b SHA-1: b084096514e9ca4ffe89f577dfbec6eeb4f070c9 SHA-256: 3f942b709ea0a409a39f32874c891d1adbc76e06b9397466ad48ecb3ed63d4d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://catamma.ru/uplcv?utm_term=longman+academic+reading+series+4+pdf+free+download PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/323c646418d9d272527387201c201fa5/semafiromeki.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210828182052.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27a9e6b0a1---3236983149.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ee0c5d06---bijezep.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba425dd16ec---49673858626.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962e7f653a1---gelepovagilezujuzas.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/30157875853.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0591c66403---tisozifogarebowomux.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/vupowe.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/refawikajakuvefufoj.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/32473578578.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8681394845332f73ebbdc95fdbe73270/sodupuviju.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/64818796926.pdfIn PDF document text
    • http://ave-france.com/pics/files/17634779077.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0416a6fb28---8369565342.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/figepedidowalekeromine.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d451b64bdbfa44155a31e4fe7552f24a/mivejumufube.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pevopeziburesavix.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17205536851.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6kqno37gt2utkv8qh18c2dti50/tefasonidegonu.pdfIn PDF document text
    • https://jetaime-shop.com/files/70564154557.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/nukowasotometakase.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f020e2f98---61788745069.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e42fd8c7191---potobububezabadabigus.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/4a462457fa40d9f63e456139109d1a88/verapab.pdfIn PDF document text
    • http://cecev.com/stockages/files/jedirex.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_off0000c34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34D 10984 bytes
SHA-256: eb06088165ab1a5f97afbc724ffe0bfd08b2245c1e9ca355db20613d049a1989
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 16480 bytes
SHA-256: b949d130a859f8d527b89ff6d27889469f43eaa9909616f62dc1ca0915c37b6c
font_02_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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