Malicious PDF — malware analysis report

Static analysis result for SHA-256 88af3b50301bea53…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 12:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a723b5f4b2ca969602b0de90059a906 SHA-1: 4a6d58d743a716f714cec24eb4dc2b5761079983 SHA-256: 88af3b50301bea533f799e36b583aebcc4b89d69101f150716ab6b07148bc632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload storage or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://galeriejacqueselbaz.com/userfiles/file/39599074678.pdf In PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0904/db59392e68d36e730192fa196fb7e0c7.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137357755963---33215319882.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbf0317e9ef0172f2f3bab6be668c4e4/nudoto.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m9n0ag0hjfhlelv2deqakn8v6b/pizekelima.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/wezadakexoxofajirunusokep.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904032318.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/nokosubinodi.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/gakil.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce27b31dd---xaladabelavege.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/44188084281.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/35774008651.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/99635145640.pdfIn PDF document text
    • https://felicityokolo.com/file/47907277129.pdfIn PDF document text
    • https://edarky.net/data/file/29906000441.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/padudosotef.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4d8be091---fixajabaxurusuvijejoxagob.pdfIn PDF document text
    • http://c-amc.com/upload/files/27878292480.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109061306407862.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/24220373872.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/40736561195.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/titejilakanivufejeli.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/pipijefatijoterunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=abc+coloring+book+free+download+pdfPDF link annotation
    • 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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 18304 bytes
SHA-256: 4a29d002fb83ae50c4370a421f1e036543e6606b6500d7c790de20a6e18479be
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 10828 bytes
SHA-256: 43211b0b4a06edcb1d4b3fcdbd2d40d0aeb3fc46ef5ec6a0fbc3a61219df850e

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