Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f656a1bca53ec18…

MALICIOUS

PDF

96.3 KB Created: 2021-09-04 16:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c34448e3ce34b8c967c21878a1f943dd SHA-1: ea5b6a79f2042cc2190435733fb8693ac5556672 SHA-256: 4f656a1bca53ec185eb641569f69c9fd10fc25135ad638e73fac14b48fd66ce7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links and the use of 'utm_term' parameters suggest an attempt to lure users to specific content, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://jmvlpslimited.com/ci/userfiles/files/15948487121.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/jetasovif.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/cea9f7a068ae62733ef64db8c25d2128/rozomol.pdfIn PDF document text
    • https://paradigma.bg/uf/file/9201163243.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a7c5bb225370e7efb9a376b741bbdcc7/dolij.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9flsvuv8pegpndac3v2fpgqgti/gegolesajivog.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607855f2dfa0d---71159480048.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4da0c503---wotakuvejoxegojosavijix.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1eeb2107---kixadezaleje.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/75212987665.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/juzumofesexexadaganilaba.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/33716110218.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4mfuer2pgsohm56lpdpbn6mu04/3949582413.pdfIn PDF document text
    • https://ksboutlet.com/file/files/pejiponizurufazopuseruj.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/filatiminatovum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84b02b022---sijif.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a2b84bf23766799ec667620b827ce680/35353102016.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ml6b9g3u7cgpm210oi4vqdlmi0/25710764774.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/tuvir.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/04c0ec3e78f021e3f7f0ef08c60cebe5/wozivixesumerezepajufeb.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/tidepaberewiluzuf.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46b24ee63---lopike.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/fifarawurojokefo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/38c7d24f3eb14e8ff9c92055ee810fa7/godar.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/gukawufupikufugeworal.pdfIn PDF document text
    • http://benrassam.com/uploads/files/gitobatarejatom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chase+sapphire+preferred+benefits+guide+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_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 18628 bytes
SHA-256: dbd8a31058fee5d7829c85cc17084ec65436e997c495d3d0a12bb64536198420
font_01_sfnt_off000142a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A0 10880 bytes
SHA-256: 68f5c9e66f28b5917422d714ba71e1552c75de03af013d88f2decb42405bd15c
font_02_sfnt_off00015b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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