Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c12b8c292a6e98…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 02:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c4cbf5b7208af77e732d035e9279e40 SHA-1: 766d6eccdb24314e13d9ac9b631403755b7c7533 SHA-256: 78c12b8c292a6e985d3e59dfd8d3a8a8864a0e49b6bac683da3d9baafe9435bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=homecoming+city+of+heroes PDF link annotation
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2e81dc24---gejipugagodajakigedibita.pdfIn PDF document text
    • http://herve-coiffure.ci/files/84846512786.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16117d704d0bbf---4775471016.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/xofepibare.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24488c147---giwobeliwarifi.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210609_B1487D0694F13B73.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/polujulanax.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/dabitigixun.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612517990dab9---94192064695.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sexusederomuti.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/43091029077.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u61frnpjd2k6194s42q33h6ru5/42390693081.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/zurolomeketozemijizarizim.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/11845791448.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/13621892576.pdfIn PDF document text
    • https://tomas-music.com/contents//files/kulukofatasimedesimisiraw.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160da2c6ba691d---ganamelusitudizidenakuxin.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb66b136e4---kolamifew.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160848a188b0ba---15315940773.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/1863244663.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/popaxivemi.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/96878309010.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83501608385.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102d02c6607e---fiduxugiso.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/19286960228.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/33801607858.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_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 10680 bytes
SHA-256: dc1d86fc6d101ac458948ccedeb405377b6a31140d86282489f84d9d96845a50
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 17316 bytes
SHA-256: 13b1887a8d1c6510c9c9b52deb48a2312f390139487e3fad55ed92628465da0a
font_02_sfnt_off00012cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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