Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a1f344b6ce91bf…

MALICIOUS

PDF

98.5 KB Created: 2021-09-07 20:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b57dadedcbb14c751701c39830ba71ec SHA-1: cf11c60d7e9c8fa49febed56e0078956c733578a SHA-256: c7a1f344b6ce91bf94b62bb88dc6b2ff4e9ea2b35e62c9ecf0f33599382e2cb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609982d957925---70048197219.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc0df107e---fedusuretatizo.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/84506772710.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/1600396037.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6577fdbae62de6eb834e25e27ab6d516/gusavupomebajufurodazi.pdfIn PDF document text
    • https://penal-garazh.ru/files/leruzumunes.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/27324817801.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/palozonu.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/56148636542.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/fuxunex.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/16993129524.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/giseporepilonipuwowi.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/guvobepixivubobideleduput.pdfIn PDF document text
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/puwetororuzuro.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/rubibulevure.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dd583eb9e---8224303695.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/41615819150.pdfIn PDF document text
    • http://air-ned.com/uploads/files/vabarabodipikasofufelu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6bfd5d5c0---xevegisuwu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fdb1261239a76df4076d02b581cafec5/sajani.pdfIn PDF document text
    • https://istanajp2.com/contents//files/91342266155.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611017735f5fb---waxodevojeparobejogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=related+party+disclosure+ias+24+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 16804 bytes
SHA-256: e609a8fad673959f744a0569dfb05ac4dba08a5c5d7e2e00e5f20fc9643fe6f9
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 2216 bytes
SHA-256: 8f704d14c1efce5007c1aa8e4ae4d46862bfdad99fb0f54a4cca4199e888e81a
font_02_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 25708 bytes
SHA-256: 850bbcc0a132de94778106d5ed9ccb9d416076ca9bdc8bcd1ce3c14388f32ef7
font_04_sfnt_off00016244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16244 10964 bytes
SHA-256: 4d51b500b8d3ad33eba23ddbd0a90d46654b0d66d9141607799d609046a5582e

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