Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9621acf9f8c779…

MALICIOUS

PDF

85.9 KB Created: 2021-07-25 16:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa600fb5ed4c1c23a50ccb03a30ffe72 SHA-1: 49c13c2b7ae295d705ad2eb3d6a5ef4f7bef2121 SHA-256: 8d9621acf9f8c7796a31e69f780889b7436c9fe2f93c28421364917136609788
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, containing numerous links to potentially compromised WordPress sites. The document body is heavily obfuscated and unreadable, but the heuristics indicate a link farm strategy. The primary goal appears to be directing users to malicious URLs hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8634537f9---49667118216.pdf In PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/h0r7n6k3k2ksl56ov7h9a453qc/jodalefuguvisikeladolised.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722f7a0722---futafabox.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160adf652304fa---42438904735.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/50688507089.pdfIn PDF document text
    • http://unseretochter.ch/images/file/54075178578.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624847922_2dbf2e49b9.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/pebakesuxovosixir.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/gokok.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/jurukasuwiwibifixojiguva.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ace0c0a9353---81132173886.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/65947686823.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mt7jnpt1avn4rl0vvjm8gq4qv5/lewiz.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/poberiruni.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/73553616959.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/jejaxomutux.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1832622a75---56809591009.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/timorejo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c95a474b---53193051800.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9f3a5de7dc5fac8b066c09b7edfb4d23/mejewasomisusudodajosixas.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f39d8a659e1---zexaworafux.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/qcjflh4qjuk7cdvfkqhg3eoep4/poxitavi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c6528418---68427524530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ethiopian+bible+88+books+in+english+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_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 11100 bytes
SHA-256: e000c89623206efd4c7bfb3c87ef7a2637a4e6477e65c0a3bc6e3c0d750a563b
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 17492 bytes
SHA-256: b379626dbc0b0772655c33a8da2b29f160c156172eb55d15410e953ae482fc27
font_02_sfnt_off000130de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1