Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3c29e2af779afe…

MALICIOUS

PDF

139.8 KB Created: 2021-07-02 21:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 712105b42f0c21cbcb24c50a697b6424 SHA-1: 23187859243b5ab13cd591cb5b56ddef5e6d6473 SHA-256: 7a3c29e2af779afe31e1b9b54a9b85c075368afc4a2127fa0b4917814ccaec31
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://catamma.ru/uplcv?utm_term=alcatel+lucent+4018+manual PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad42d914e9---nalatidobosetinezuzege.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210628_001EA6F7717FF9B5.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48990c238---90815220076.pdfIn PDF document text
    • https://brs.jo/userfiles/files/39032846584.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/bimuretibesaleful.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54874c07f---megesatodupizuwuvoxoti.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c6d9cbeb5a7fe46799367b3c7ef30d7e/kexam.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252f6c2ac6---filisimavipawonosubebej.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607710e212f0d---51404755592.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/tulitut.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/pke323il1jepepe9mb8j5ldqc5/dorurudifelarovu.pdfIn PDF document text
    • http://contextuae.com/resimler/files/nexobibegiruva.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904ec922bad---nobifebenovowo.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/65851771337.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4bda2bcdb2bcdcedfb2820b51e645b04/buxezidu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609760fbd1769---54746344080.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/donokarijinezut.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16097d383c1da3---pujaxir.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/kalopotaku.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609effdb8f27c---24229454611.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/itojus.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/39508477.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C113 10452 bytes
SHA-256: 91c741e0528a12783257d3387a42e4b31e7a75686642f8e32255c7c47ab5f37f
font_01_sfnt_off0001d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8FA 18848 bytes
SHA-256: 0c6db34cb59749d376e6a028527619622f1634105672031069c156f20577e980
font_02_sfnt_off000209e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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