Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbad5a3aafde460…

MALICIOUS

PDF

92.4 KB Created: 2021-08-02 00:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48177e1a59247ef87c5602eed60f8a35 SHA-1: 132d5170404c41f20af3a7c54ead65fd78ee287b SHA-256: 4bbad5a3aafde460223b03b1442bd70d599aa5556dc6517cab61a24c564e604f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aiming to deceive users into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=cimbra+de+madera+para+trabes PDF link annotation
    • http://sam-global.ch/files/file/jolejizumupo.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/49351542377.pdfIn PDF document text
    • http://arslanemlak.come/file/gixabirutojisake.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/51cba4def9ac8f51f0c4cfecb0612fde/23374136055.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/kapusafevukodezokubipix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e556df83---19694863871.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/zuwenogapo.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/18621984075.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/biripofajozetevapamawana.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/fiseguj.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/49972999207.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56e61c4b1---12597583496.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/vafavalo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a37a7e7264---23903653432.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/59204109496.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d42d73b3d5f7599472ebbdc8a970af3f/83731698599.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nasiligafoxiralina.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/84e81955d00c37b75ec967559f0ebc54/81431975748.pdfIn PDF document text
    • https://begili.com/uploads/image/files/64336102212.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/somofik.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e9b58b83ad3ee54f9f2335c5c6a11a3a/letub.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791740cb321---tiwusomogumodexi.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/53843637004.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/56749514973.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_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 10452 bytes
SHA-256: 0cc17fd8be464d49f8c9c107a6cffeb4fa7c737d0c7cbd15a511efe7011c3481
font_01_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 18184 bytes
SHA-256: 33a14071fe7bb86217f9761eae34036ccde2770a3a80892ec78e6cbf0f7d48d8
font_02_sfnt_off00014911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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