Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a352d3fa7a75b7d…

MALICIOUS

PDF

89.0 KB Created: 2021-08-05 18:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3bb5d90d612d7b7fe295723a3d5d263b SHA-1: 8b1fc47c4b5c3bc9c9958c64a8cd3cb4c96e048e SHA-256: 4a352d3fa7a75b7d77ba4852add9cf8ae53c43b57faa93435d8f238e638069a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tvtamminhphat.com/uploads/userfiles/file/3437513024.pdf In PDF document text
    • https://kocarbonag.com/luutru/files/93781919171.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/80455919278.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/38391833620.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9c9c2d99---47637042631.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/fesijaraxejiwesivulogina.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2621de8a97dd46a346979f417ed4aaf5/wiluzukapoluj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab752c9b226---36589579795.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98c084dd8---68319433217.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce89728070e---2648846487.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/91843098685.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/69820944903.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/56207bb4df7b2de24b5bfce6bbd70e38/82923758970.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/87387577585.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vamijoxafujavoda.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5f200e134cf37fc3d79bc8928de9234b/38680657038.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/dogaloridevotirinozifira.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/euo5t2d27tm7lt16u4emfr7hds/sedojav.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cff08d031b5---mirivafirigajolemisenopuv.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/wolitit.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e6bb4319a---wawifaburafofisivadek.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ad208185b---fafivejaj.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/funewor.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902dc9b92de---muwaduzawizujinetule.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/vavedokigotozanuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=excuse+letter+sample+for+school+absencePDF 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_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 17248 bytes
SHA-256: 732f2553fae53c0551f356463d0df124afc36207b5e7be51b45f82b18a0eeb23
font_01_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 10976 bytes
SHA-256: 1ab25f0c13ea56d957e64a6b66b71b482e3b1acb491fd9dbfa89ccc7ff3e6203
font_02_sfnt_off00013e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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