Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58e39a1d05741c4…

MALICIOUS

PDF

86.2 KB Created: 2021-07-03 04:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 77d23cc780deb7c610228b60f45e1082 SHA-1: d8963e470254d90e64625d105e1c000784699e68 SHA-256: b58e39a1d05741c4fb25f2c942f7c175b3b0c93b9062bc8affc4e7d688c6dd89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=the+first+commandments PDF link annotation
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbcd686200---kaponitorul.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084920d57f4e---bawexeb.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/73073381459.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/40811360779.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e4e22932c4670415646c45ca1f8748cd/gexukobaka.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/104cc6e39dfd1c9aa30fcf0ac72d87cb/84316926363.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a41bc73415b87a14813703e4b7abb5d7/wogujaxokedebugosujemowif.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079d828323f1---66740911154.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1625fb4c395a1369bb11927abdce57cf/fetegibuxatitakipax.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106261046508512.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0c6a94ffa---78996365631.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/pedarinukul.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/079de25e54e2de4fc7339c70040f070b/1212984064.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/68jmi10ubcn2163hk8u22v75r3/jenimugugotasomex.pdfIn PDF document text
    • http://www.asslar.de/downloads/43833985577.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d94113173---8468535497.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/60d456601accba2428a58ddbe329e7b1/witabobisavumidi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160766b0de9871---64225274792.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/se2rp8ehpp6lmk6hg57if57ap5/movamewokez.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/58616593473.pdfIn PDF document text
    • http://premium-h.info/files/files/75326632951.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99e995104---buwozuta.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/xofebufimixuj.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/54436289597.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_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 16760 bytes
SHA-256: aae6b4529ddb98f20e3f1030441d723ccc86cf2a47fa733d6dedf81ca5ddadd8
font_01_sfnt_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DA 10660 bytes
SHA-256: a3e4c5b1c67b39279ad545cc936725954406372d8b62294dee597c5edacdf346

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