Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52cb8f557a4848a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 16:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a5102a881e3ac64a47ea95237c26bf8 SHA-1: f7b261ac8136085d1995964983165b07eeea9804 SHA-256: c52cb8f557a4848a22aee0f3ab3b87fe3b8cb202d0768d090df8db27d33a4cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised platforms, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=digital+image+processing+second+edition PDF link annotation
    • http://tipiland.net/upload/file/56045142796.pdfIn PDF document text
    • https://ferropula.hr/files/63907491828.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/79110579732.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/50511696324.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/gimuzuwinamakefeke.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1827c063---59223950974.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/topopuxewibudet.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/fojikaku.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16315954571383.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2e61f3a1---64651310092.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/29607216452.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/23025604022.pdfIn PDF document text
    • http://ceroki.com/image/files/fezogedudogonasulebisutam.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/foliz.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/81065226648.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109201259161789.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/50296027219.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496c69cbeed---mikolepajisojeravigev.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/15230059764.pdfIn PDF document text
    • https://spacio.hk/attachment/file/mulunikawupusonupefi.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/75859872427.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/sogaruzefujagi.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/muwoku.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/58186974030.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_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 17200 bytes
SHA-256: ebfc90434e6bde441a226df0c57774e0650e32d696e282cb928c39bf5162d2e1
font_01_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 10856 bytes
SHA-256: 48da5b99e32e41b80b31d162f7b4d162b608f39cbea503b57e979217541f6edd