Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37d5b5121fc9cef…

MALICIOUS

PDF

78.1 KB Created: 2021-08-08 03:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9032eddec052ae17eab93fd8cd05ee9c SHA-1: 75854800b4f5ff1879386557103c03b1ef201d2f SHA-256: b37d5b5121fc9cef0a6f8cecaf6aa288e17089084951e276af0a8e3ce14cfdca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The PDF contains embedded URIs that redirect to various domains, suggesting an attempt to lead the user to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=cambridge+primary+science+learner%27s+book+4+pdf PDF link annotation
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2e3hik614ck9i6v4kdfaeh0f0k/6264043201.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/bidadajegibabamutizi.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/difadazitorufi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63b05df1f---zedutagibo.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/49962042379.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/misowanidopu.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/miduwaluxak.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/l5ht023q6ugbg3q15lj2ph8fd3/xekifarakumow.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/pafukipoxakametaxiwok.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/32255195523.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/j0n45coc61lm20bufbqjcvd2df/72211772743.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/1040076043.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/jiwasokanujigu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ece3465fb4c354bc390640bfc554a4ff/jadiwenovawidukavijuvo.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791fb1a26e1---24208607275.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/xuliwotinobatuvetaruvarub.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/28744014321.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/popurakop.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/59166989365.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16089f478c6ff2---zopovezupag.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075af18673c1---teronufaridimerafa.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3440037566b4df10160f19b928ea6a45/ribumitavikof.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c596a39b8042f398574f75f85bc842c5/suforubadin.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_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 16580 bytes
SHA-256: b5fe65fbba16592ca0b61aa258b36bd246ce7ebe961cf41085e69bca129078d3
font_02_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 11356 bytes
SHA-256: 210e4ebf1559eafa31ed9a3ffe9430ee6ad759e6feaa15a4dff8a6f2042aff22

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