Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7f632f642d5818…

MALICIOUS

PDF

94.1 KB Created: 2021-06-28 21:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c56282ea5764a7d1bf32950e9bf9423e SHA-1: affe302622aa557d3abbf4402fd25bd45690ee84 SHA-256: 2b7f632f642d58185298a2b028f6bad6373ead44b42cccc3412bc25bfb4c054e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://medvor.ru/uplcv?utm_term=p2br4+covalent+compound+name PDF link annotation
    • https://cosplay-expo.it/ckfinder/userfiles/files/84532758016.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/gigebopo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/da997f990b4176e02c50722a17669914/1797673654.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5d4ee78000a5f816771848411f264b6f/zusixosiwatedopebezu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/49cbojfq70abkoo859s4su5drg/36132525955.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9c16af17---83721131601.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503094822969886.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37946ad58---95711738597.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xarawojizuxoditurakije.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/27f4ed431be553c07cee1854051d3e17/622327044.pdfIn PDF document text
    • http://zae.me/datafiles/file/pudomilivinex.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/85096434075.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/17904939071.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/93360b37dc62db40ea3c1f0319f353a0/51873086302.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d499ba4294---fuxelexujevatojebivi.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/11094000525.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zaginugudojinabosidevawi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/de69f34a7060618d6255ca8deb21bbbe/mesasime.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/14266151710.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6abt1q6dt86mpfjjvand21s1mk/mazawiriziwanapetomi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e9854f074f63937ef3f10fff57118eef/vubasefagamala.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9a421585bea4d666486787720321372/67542671842.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/xuvokin.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bc1d69ba2b2e946488755265bf64baf3/sinupafedasesav.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbde853f37---16595600965.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/7557302810.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_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 10920 bytes
SHA-256: 537613ca6e28e489ea9243a193521d45be9c6ec71778358b879ed367e49efb71
font_01_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 16796 bytes
SHA-256: 4f6ec77d61ca271d806418a30e3e79c8f1008e3804bffa120ad6b04b1fba1730
font_02_sfnt_off000152ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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