Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc55718df6ff74d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-04 01:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82d5214b38919c6d5a349ccb6e862158 SHA-1: ddb1ddc1032b77a2a754105aa90c54f865bc0e5a SHA-256: 4cc55718df6ff74ddba61ffbcab763738a02c2cce3c57b0678806d17520e4424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=nursery+syllabus+cbse+pdf+2019 PDF link annotation
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/31614893186.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o4t4c9jhvrm54bb2cup47nme12/sakofulifiwegade.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/voxebejagudakuluzilexipu.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/zozotesilid.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/c8cudn0l59mtr2m3c9tl31v3js/wogajekotewulalewazabel.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/16662224934.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/duxaxolapumevowamitijajol.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/59a4350fc9d54f0c341bf1676fa3a854/11321309335.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/53902775432.pdfIn PDF document text
    • https://senfina.top/uploads/files/vizotamekomaletux.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/6igctkf0519usg2mppa6e1vv9f/nosilipenizorigatetasikit.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/xaxokegarafob.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/fogojoponeka.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d7f33f224cfc895a960e2c41b9704ee6/62662755967.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/5e5753a0d269a3d0a95dd404722d9cef/vuwoxukamunubufigagokaw.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fvle27npj7vsmkn4mp5bl4c0j6/70185845877.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0db2e5a324eb7e6362ebcdad5a23f25c/zuvisudijono.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f855276139---futobomebozeku.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f432f47c4c335909e26e18c37854abe6/48916757598.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/99511653697.pdfIn PDF document text
    • https://teddybestore.it/file/luzap.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 15128 bytes
SHA-256: a6e24a1b2ffe59055e9e39f5023165773c9a4421c07ab8418ea41ceda571f1be
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 10992 bytes
SHA-256: 2866552762073c7965856ea7da1e6fcbe11938b3b5f042063e2c4f0167a3fbcd
font_02_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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