Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f54635c240e611…

MALICIOUS

PDF

92.0 KB Created: 2021-07-06 15:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b6518f494f35bd7189d778e2f3910a3 SHA-1: ef51fa6dad795b66702e5f059afa5529c11d0622 SHA-256: c3f54635c240e6118b915133ab569c4be330764c88f74ca87a620b86c0e25a6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ac357b5a---30405092023.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16096a5c52e5fe---68885817565.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8817ce599---kudipabowoginabose.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba46cf7fcd1---dopizubetevorutopejukoma.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607173c622bab---52609446657.pdf
    • http://stpatricksreunion.com/clients/84553/File/54728472361.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160720ae6454ca---zoxezafir.pdf
    • http://billedbutikken.dk/articlefiles/file/kezaza.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160892b135f70f---lelesumugoneb.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b8bd6e71f406e4362c1e855d74b52a96/71054722679.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5961fae9f6---sinozarerefuwewepoputud.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4039ab5b17---44127963003.pdf
    • http://hongshengfish.com/uploadfiles/20210705/210705200448014514o29ii9m121cl.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0765bde2e---18991719097.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3924335e---71901958704.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ccobdcgnu9tv4ht99mu9hl55pt/gomokejowolat.pdf
    • http://firewheels.pe/userfiles/file/lupitatisabogakufar.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/def0dd77b230105910de5b870d4d8bde/15442597946.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28358ae4a---nesoxiwarifefadosudutog.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/56d2ehu6ado88rk7sivgmekvu8/19422752647.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45705af23---dugapudi.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c88739bc---wovepudakutojuzelexubibel.pdf
    • https://acryl-bg.com/userfiles/file/likasonirefivel.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ee44f3a5c2be098808b9d784ef3019e/44385063221.pdf
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/rilasomawizivuloniboluge.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/663dcddfd38d98fc784125d37c23e9cd/bitisi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+college+farewell+quotes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e7.bin
fbb7b896a79c4c0c904167a3a126726f8dbada204d744a4c848481879381396a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 10700 bytes
font_01_sfnt_off00011d7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 16792 bytes
font_02_sfnt_off00013591.bin
df63880669d67522a7bd7444d109cacb7119e4f6634b3d8b8d97c804b6e57cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13591 17596 bytes

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