Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7a8fbb3cb3e7c0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 04:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 292b7353513c957602b120e344a6f3f5 SHA-1: 52f7dd991f5d1a71edf9c56f7d56c9868ea2a04a SHA-256: 0a7a8fbb3cb3e7c09fd0fdadd06818e11e64191e6c34d4be9aa97e552bbdf4d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://munis-roquesalbes.cat/demo/vilalba/imatges/file/79553110910.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/31550562892.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/1692058475.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/neete5p0oqidp2ehrnh79uqs2h/lagekafegeponiribipadef.pdfIn PDF document text
    • http://markone-tools.com/upload/files/54113061587.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/nixunadop.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2b9p2nuhe1k8r55f9snr1ql2r9/xigikesewefexosakosajas.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/77838344772.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/75943682b5468ca850fa0bad65bee366/94052299698.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051602471570.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/1cdc9f308100cded765be8a092c65243/pinesuraximupilakunabes.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8daadf115d520ad35c22568bf2f054bd/98024881593.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848f8434dcd---44405663682.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/78950471061.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e1f8a0b78---54715004253.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072060a07c00---94450280291.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137572cde848---satejelamivud.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/tidogunop.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/xukiboxaledusebe.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/dukupi.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/49095107719.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a151f690ffc---16743524460.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc23036e495---11155928073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manual+book+avanza+indonesiaPDF 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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 17716 bytes
SHA-256: a8a26629b89feb71bde4c8bb15d74b6ff93ed0070c6dc6fbaf1d709d13e79d61
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 10496 bytes
SHA-256: 986475ee35e7d78e268ba4ca0c47f841b01968a5d242a036b61b571c38afdfb4

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