Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82e3012198b84a9…

MALICIOUS

PDF

77.3 KB Created: 2021-08-23 11:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a51b9827b7031fc88aadd9dd8ce53e37 SHA-1: 38f1812cc9e63cdbb90480d6a1ba6024ac29332a SHA-256: d82e3012198b84a9d8fc4c06bd18389afc97ff6b85fe403c3fd5bcc51d1339ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://szolnokepul.hu/userfiles/file/68156853985.pdf In PDF document text
    • http://chaukitchen.com/uploads/files/34085418342.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/vekefibujina.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/gelujogariseweper.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/20925244515.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/terebonirotevokiripix.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210609_65359B7096158E69.pdfIn PDF document text
    • http://rjt1.org/upload/files/sisiriwuziromugukoxufe.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/migaj.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1e24fced1f13f95799f264996a18bf5a/15103190851.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b31b9c55ed---89577649096.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c877ad20925---99469107764.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/41950197840.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc45623a84---52237178983.pdfIn PDF document text
    • http://dgjst.com/upfile/file/guzos.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/26007640010.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23cc0c917---xazedojufibevemi.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/30607160155.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/39769443981.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/minakanupar.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd1607eafe---29097474017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=anti+malaria+tablets+onlinePDF 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_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16448 bytes
SHA-256: 8daceb756237edd663b8e5b7bef82bf87f33f1a2562b43b337bd45b300b4b6bb
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10392 bytes
SHA-256: 1a2ca87a89a33f32e0911aa9f7908ecd2e5fc32a0baa5b1f22cfd62958b6eea6
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1