Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bba029d092c644…

MALICIOUS

PDF

93.0 KB Created: 2021-07-21 20:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7725d18dd477dceef10977d6893c3871 SHA-1: f8fe7c204d0bed17d51c0a1ab1b2b7e21b9a2749 SHA-256: 92bba029d092c644a3aab6bc230e0ed7e32ee8034d0dde315d4ab24f30ce0b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests this is a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://matrainagycsalados.hu/userfiles/file/1120247193.pdf In PDF document text
    • http://frezerovka.by/images/fxeditor/file/kirun.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/682943f57ea62df376375562685eb484/59928650358.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e26720671---35604380658.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/79176107489.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/ketegovi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/176b67dc6bd3cf92b95f36d28350be27/velajuwuwalirolimav.pdfIn PDF document text
    • http://healthywithhart.com/res/file/35314703992.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/zazibiwironupogosu.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/49463958797.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/kedafexunav.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/67195916373.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/f34863fa771e6e7c9810fdbb43c8e93a/tibividulesizof.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/11672213674.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/tofapuzokikefoxiv.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6af3772b0be8c1564e932ac4a1f16ee9/dilegewiki.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cc5ve8p7o52685nf3fe1nu40u1/31380482917.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/kenarozuwozevadawub.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/3781900429.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c404ca04d---zitowovixazin.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b647453af1f---xevalokimosefefofaguta.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/6576425709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=scott+foresman+science+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000efbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEFBC 27616 bytes
SHA-256: 44694c84f5b6b7eb5d6fa0af4c8bd2cde054a948f65109d41d28d54b8e415bd8
font_00_sfnt_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 10944 bytes
SHA-256: 6f7b79303b5deab7e56b0c4932ad453756554460091de65a45060a252852b32f
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16644 bytes
SHA-256: 0245c1cd07801ac2cf9aa4fbac45625655a6c56b570c40bc160bc9542cedb15e
font_03_sfnt_off00014c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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