Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa000b8aa7d5098c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 10:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7812afa575574ca1e1f8e4c886fc3f2 SHA-1: 7102ab41de856e00f29d461916cb46eebe80cc40 SHA-256: aa000b8aa7d5098c20ea19f3a1a2f3fb36687e354e1977ae17265b56320232e5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external resources, several of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jin-ji.com/upload/files/13401463341.pdf In PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608877dfcf722---67552238444.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/bisibuvamabepot.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bcitoff7sbonei4jc4rnpfuvct/kodelipulu.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/7oloenhav99bllo09dm5te0c6j/bojefenipexoka.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/16855729061.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f45dcb9e---83255997650.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/42585792839.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/44093825242.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/1862716563.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9da8c282c6cab5024220e8dc5696b623/34858296686.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8f5f99f0b---lelamelosanize.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/lebufewakemanozugikimew.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/89333651344.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/7542245048.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/57512606724.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/balaju.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/33069370986.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/rirafogimepinuzuwidite.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441188ce3---neneboxalumuxuloz.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43e3b7c18---88616869141.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vufopagak.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ce23fa7d99693e5909329b786ef9f0f7/68143286255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=subsea+pipelines+and+risers+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84F 17900 bytes
SHA-256: b70bda3758ac4c8d2a63a5692993c1cc6b6732dead1012bac1754a8ae13d1f04
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10588 bytes
SHA-256: f36320096c15eb30a16f3300f6daac8b623fa689cb7832a60f02ba8fea632af3