Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc62b17c81680f38…

MALICIOUS

PDF

122.5 KB Created: 2021-07-13 19:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4c467c1ad649fda77ba2308f2f6c216 SHA-1: 0c2c83400e53e024341b9d16fbd815d6d6fcc12c SHA-256: bc62b17c81680f38396ae29b3acebc88a7036dc98d93df79846390a5d47cff33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 https://laborke.ru/uplcv?utm_term=the+amygdala+is+thought+to+play+a+role+in PDF link annotation
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vqqhm28dfjquqsa6geql6hikv9/rudomorek.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7507a378b---nilamovivakonozi.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/veretalidumegi.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/movalegoxil.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493b8427d5---18875805623.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/folofogifatidulasafi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc60c1e884---vodaliwib.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a21d64267---54642723764.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e138e22f0f---relololonajupapove.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/vunimowujomisijudefak.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/69657890713.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/19599759724.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/13863308187.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/lni1sq3lrr7hcmc3uk4itbrhqk/tunefovelawena.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1ff12eb896ceb339357bfa7fca7552f9/fuzumudo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/nifafabevup.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c64a6c31bc6---73320823743.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/8e62fb9f3ee8349c0c7a93f815759675/xaminetadese.pdfIn PDF document text
    • https://7gking.tw/upload/files/41228999900.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/62749574474.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ceghgunachre9k4hm39men41ot/52755270058.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_off000179bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179BC 18092 bytes
SHA-256: 18560992b4f33d923239b112f108d37e0f3b062aeeb5a50bfac5eb0fff8ad159
font_01_sfnt_off0001a998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1AF 11016 bytes
SHA-256: 8540b7aa902c2d540e14c658cf88810925f3eebefa7ac0deada52dea55160192

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