Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d852ba2c7af030…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 20:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d4ce98cccf6c4fcf61d2aebc8b8bfb6 SHA-1: 246a5281447ca9b85e28823cc695356601512314 SHA-256: 20d852ba2c7af030e08570310bdc279b0ec703cb996af36ebad48200f5a6086e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rcot.org/userfiles/file/jixuxomunotedikenajuvisik.pdf In PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2ba46392---67579772783.pdfIn PDF document text
    • http://17njl.com/userfiles/files/64069891592.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c4ec4b9030b3d92dd91e3682f656f439/woxumakedudejive.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7m4kajfigedu8sruga3pq65d3q/71567981930.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/jufija.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/dokutagejuzapiba.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/53758256864.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/gejisixabupefadomef.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fepuxagozatazobuzugowulux.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///87697633890.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888aece676---zusikozo.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/kaxiwamimevawezofavanuzef.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/36798618446.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/winifulixovexotuj.pdfIn PDF document text
    • https://quizai.com/uploads/files/27551787638.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210908_1EA24A44F6479F56.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/wujimokimu.pdfIn PDF document text
    • http://expresskaliski.info/file/diwipuvataj.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/kaligilib.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/69560407166.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/58509333313.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/pabifosemulelab.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/xadobibitixowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jailbreak+8+ball+poolPDF 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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 17596 bytes
SHA-256: 1793b48ed0ff33611d31e2dd6e745da83ba52c3bd6c32c2f9d0323b45ac4ee0b
font_01_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 10304 bytes
SHA-256: 90d92bab45f93b7d4c5626655b4a63e04579e4e37700c96fd349523501d449cf
font_02_sfnt_off00012b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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