Malicious PDF — malware analysis report

Static analysis result for SHA-256 811ca423264654f0…

MALICIOUS

PDF

92.7 KB Created: 2021-07-16 00:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6998e8e128c750b1b20e2b4c1e926c0 SHA-1: 5a879be001e56034461a11d3fecee4b676420d1b SHA-256: 811ca423264654f084e966d802a46a7ffbd0399b82650077932d4c3dd6eff533
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution vector. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the ultimate destination of the malicious payload. The presence of these links and the overall structure strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad489131e31---3937338050.pdf In PDF document text
    • https://bandotrading.com/uploads/file/96709856033.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903b2b22110---wuvuguvamugajugisi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160882b8c3d33f---zasinitosufujelomada.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C6922CDC2D8.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160971c7c7dff5---jipafaj.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/begitixabu.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/j24ibdmvagopnha45sq2tjidul/92512337413.pdfIn PDF document text
    • http://cichanski.com/Upload/file/saxagubizalugemugezizi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607fedb1ebf51---gugojexefedosabawajizo.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c75419ba7dc192ee9e4e768ce0f99c75/bulusujuwinivosipagama.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/dexitanifonofo.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/xolavobadopivobufudu.pdfIn PDF document text
    • http://geose.ru/userfiles/file/39937915945.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/90082004215.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/20810775544.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609f95601a843---delarubenajizexerosezodew.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be30226d6---zopawivonekasibelejexu.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/nuxexa.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/30428841260.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b1b2bd51---fasipenifasegajibeja.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d4f5461f304c565d75d81ea32ce13cfb/dalitusewemawakiz.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210715222749.pdfIn PDF document text
    • https://ckmandarin.com/uploads/86775547354.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/74365257081.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e676c95da6---95331253782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=symptoms+of+goiter+problemsPDF 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_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 10764 bytes
SHA-256: 4b819bb38d4b48a317837d659c3b77ac72ea49b33847d7dd8f710613a0716c82
font_01_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 17108 bytes
SHA-256: 9c2f2a4886330a32f399bf2b3e23c5c0a14ce7e5e143536a78c8811fe1249038
font_02_sfnt_off00014d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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