Malicious PDF — malware analysis report

Static analysis result for SHA-256 5130c83ac330d8aa…

MALICIOUS

PDF

104.1 KB Created: 2021-06-18 06:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6bdf72d5869ecda54362d5bf44b47c3a SHA-1: b5ec71c414348ab679de6a7b89fcc1e82ccc3374 SHA-256: 5130c83ac330d8aa3e179b1906077759255f777724a4d2875becd28076c23330
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The embedded content, though heavily obfuscated, suggests it is designed to lure users to these external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://oniceh.ru/uplcv?utm_term=beethoven+emperor+concerto+3rd+movement PDF link annotation
    • https://aprilboya.com/userfiles/file/70508635688.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/33595456807.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/kk68fb15msclp0jih9amnckbl2/49646345779.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ac3466dfe3b7357b110a68ee7b26ff22/71453836610.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba700c1f9---zuterelupugezexodidiben.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/10154707400.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8854c9d20d6bd82536b6511758163f1d/48085405057.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/43e934ac0532c36838f7b4ae84466532/guwebutudimenosavemun.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/347c4236dc5bb9f6cbfe9f90ad6f6511/62605776183.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b09fb0a797b---79364731627.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4fb43721---sinegudurado.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5c3ad82288713b76895fc9ef2d7a5ec9/57593909632.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/98a239e87466cd34e558cd6c1cce51d5/xagif.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/7926792407.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/334bpl9kcf2a4pt481km2t1n8b/dinumofa.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/19197696500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 9424 bytes
SHA-256: b80eddbfc28bfcbcf54415524686d8d7b6684657f8aea60a266fc73ec67dcd04
font_01_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 5168 bytes
SHA-256: 4ad94aefc91972f99cc059e3c5ff6945635ca14aaf32d1bb92b30c7ab6c06533
font_02_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 2060 bytes
SHA-256: 6e9c2225690a294e4d6e366e768ddc3c6fb43e152ccb516d6bcc7b5d919d3d7e
font_03_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 8756 bytes
SHA-256: 3247aed0848987362a731c009bb3f69f07af295958479799fa99cd4c3abca7e1
font_04_sfnt_off00013aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAA 17708 bytes
SHA-256: 79efe957ba6b5d00e42de753a71dab68f45083fcb2ec2ef9211367bb1b00eacc
font_05_sfnt_off000172e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E4 18428 bytes
SHA-256: c5f42f9a8812a66160b99b4a7492699bbe3c7a627fb99f76598688aafd3e8297

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