Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c383b578c3fd9db…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 00:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30bbfe81160c394c907bebbe51686f1e SHA-1: 30f8638d9640913edb555145eec16937c4c403a3 SHA-256: 2c383b578c3fd9dbcf6dcb619ba4e677ffd8b43373e0ee18b4a13671363fdf0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=good+afternoon+thursday+images+and+quotes PDF link annotation
    • http://allmedicus.com/userfiles/file/vafelagotezixu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fa71366d85300dc202dbce21d3a50766/tadinibolezirawati.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d325723242---43688284265.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a35e2d8ae4fc823ff6835cc5484479cb/12310667786.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819e7dcc53b---38965748389.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/58253779007.pdfIn PDF document text
    • http://charivne.info/images/file/59525122574.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/68009f55f73fe2aa5e61fd861c1334aa/jukusu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/45622476322.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/bilelebumimojajulekix.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e754b756---28990233297.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f5fbf187---31234292971.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/685fdb7b6e8d7a1ba66eb37e623afa0a/sopob.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/rinuzegudititepoverekom.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bc6318d89---tiwutajozosebajufevofamu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/95353090031.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/82119772260.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99f19361b---23870827805.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/domexubom.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c914c9f4c---bobegovatovuvagipowobo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1d515a68---sodibigipadamugonadi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/xukegosapufewa.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/filedumiditodoga.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812db72470e---79983852813.pdfIn PDF document text
    • http://fotossc.pl/_files/file/55473603197.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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 17116 bytes
SHA-256: 6761c14267357f49545b3cee788f13a2e476904f99f891e77f6c07e50ca0ce2e
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 11152 bytes
SHA-256: 9f899c3aacd1e54f08c238893ecc1db439b3c2be5149fc3163ed8af81b5adb7a

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