Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83bbc026fdd980e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-20 04:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2079f953f209ae4b399c3a81d7b46bff SHA-1: 737c1840cc24fdd2e0b3fddee6c9751718040dc5 SHA-256: f83bbc026fdd980e42d7f13152a6c18480478e7ad69521db210919f7f8643c61
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hnhaa.com/userfiles/tnejp/files/dojuriwosoxiru.pdf In PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/47374337174.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/53278159227.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/59783896527.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/27968663454.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/225j5m91iehqadaue8deps7975/62901032050.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c948de2e434bebff6159791d2d9b0641/wiwelolofarerotepasuvedon.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/zilunivuweresuwilisoken.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/sibaxefegikesugikep.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109012153555010.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/tiwiwasotasajogiseku.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/jifaju.pdfIn PDF document text
    • http://vecsecity.info/editor_up/77520104643.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/91a302d2d1bff4736494a1af0b7c6eb9/9225472763.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/zujidolojulexarabovelas.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613137fce4e0f---tubazuwuz.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/49620377345.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45897674830.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/relesomojadamo.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/29316473925.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0faijmvgt2fi4gqhep0m2hcdt0/15903557996.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/6955e2caf104e65b3c6c54032892555e.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210917201032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=crash+mind+over+mutant+ppssppPDF 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_off0000b4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C0 15208 bytes
SHA-256: 670b4266dcfda516ffbe3e9ee27ab14596f57b9b3a48af713d675b9807e59ddc
font_01_sfnt_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 10808 bytes
SHA-256: 39bc46fdf4c152cddd139d6914a575797e88c361dbd5f87fd066fd411aa89f9b

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