Malicious PDF — malware analysis report

Static analysis result for SHA-256 422e020c994e7276…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 14:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2ec634bc0215872ffcc8edd9ecbb188 SHA-1: 118c75fe21f835741114fac5f79823d62c923462 SHA-256: 422e020c994e7276ba6423c1e33162d1e861ab71a5b2b378ba6a77e93e448b19
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.jindatunnel.com/up_files/file/moruwusisujoxamekodu.pdf In PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/jifizaredogige.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/88122797796.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/sifirujuzawufomeliva.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/68372297100.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/7174845215.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba4695c1c---lofelexivivalumuk.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b1bdb706f8d509e8cb6095e5edc7dfeb/ramukivupirirupotivewa.pdfIn PDF document text
    • http://ipublicity.cz/data/file/99745276683.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/nakosube.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/jezeturubirotubozigefaj.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/kowoja.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/72816968155.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/92984514998.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2a6c2b20---zuxinigugadanositagomika.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zufos.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3b5a1aa4---48978079306.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/tiwuxaxumodadixu.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/getin.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/11231793967.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/gokonevuf.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631296190_b9566290bb.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/75521531184.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/bepuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+screen+share+phone+on+laptopPDF 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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 17836 bytes
SHA-256: 74f86b401f931a1457bdfba68be63dbf0e01aec3e96273787f13b52399402f83
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 10456 bytes
SHA-256: 9a828bd1f6943967ded788846bd490430727069469e6e27b2ec46175ecfd4356
font_02_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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