Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb2161088f3c003…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 10:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9656c5d4324b5f47534b18e8f08ab558 SHA-1: 868a99ec51769dcc435c87b8285a0427d53b631d SHA-256: 1cb2161088f3c003d81c679e4019620a018ae63a37d10862fc02dc6e2d4f32ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The PDF structure and embedded links suggest an attempt to leverage compromised CMS uploads for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=philips+avent+pompa+manuala PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eea00e8a7---kivefetukapidunijimi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hin5db27cdg80cu35lk3jahin3/77686632173.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/49093774458.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/lutuvezekaworimunibo.pdfIn PDF document text
    • http://myesen.life/userfiles/file/voradofaxalarejudaxelap.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/pesupabakalegatamotu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d2e538a72d9bedbe4dc1a820ca951459/25302055016.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/l4cthsljc968t8e7r1bi05p8uk/dadedulikogikalur.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986c674f0ec---9993280047.pdfIn PDF document text
    • http://smirna.pl/files/file/runefufenunimuvese.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/j1l2ahrs7e9pe0o6jpsn0nd60g/zipojitilusufifakupa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2729593a42f003db3073f7d4a7cd046/fozajajisotokajirugo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070dcbf25c22---6340729986.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/30d84f542db6b0efb0db47a13be11b87/45261338891.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/i0rp7ur7pp9um620o3tue3g966/lexod.pdfIn PDF document text
    • http://viorina-deko.com/images/file/fifaviloren.pdfIn PDF document text
    • http://gdgom.com/upload/file/2108081311444665777zvtogk65ppx.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4ee68ad32cebd8b6060d2597e36459e9/tadavikup.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/masejogovujugiga.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743520767b6---lunaxajebikozakujopikos.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/11s7ll8o6nd22senekofqlts56/kisebijuzez.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_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 17172 bytes
SHA-256: 88dd5979d9c78a3739df52d71b804d3c53a3c26b131782b1326c146f0c0cd8ed
font_02_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 10584 bytes
SHA-256: d4e657089535a157609cbc17a5f604603ec7681379f703a2b6bae4c99da7bee4

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