Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8d92d333984e5e…

MALICIOUS

PDF

89.2 KB Created: 2021-09-12 22:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ae42990498e3ca1d25b2de8142226b7 SHA-1: f067625c49e6d0462f1e7f94486ffde8069bb138 SHA-256: ba8d92d333984e5e98dab935f232bad63c64a378abaf9ea0ac0facefaf4a6806
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document contains numerous links pointing to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mimpi1pusat.com/contents/files/53357016725.pdf In PDF document text
    • http://topstec.com/d/files/79302235995.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/58950332172.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2s3qndq18l5ue4qbas8ngulu7e/jisobod.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/55714890881.pdfIn PDF document text
    • http://umhouses.com/uploads/files/66011688562.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/xoxivivabafilisunuvikoje.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/87565645175.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/fokipogizolusukenakif.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24074067210.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/19184638606.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/66381659380.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/sitonufifaru.pdfIn PDF document text
    • https://costarica4d.com/contents/files/visonifafelowikasig.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c209afe01---33378733710.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/22157848603.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/sanapozitobi.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090318140957.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/xogaxakogedizewixoledolu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161305309323d5---vopuxeliduju.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kitibajotakupeluvatuj.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/puzanegakedatoganubo.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/72129710110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=install+chrome+in+android+tvPDF 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_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 10652 bytes
SHA-256: b86aacce53841f2f5455e4efbcc12440aadd8808ce0bf846d4900adecbfde1cc
font_01_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 17684 bytes
SHA-256: 82dd96831355453d8bf402136b540ac1bba121d2d77b2846f413ec3f60e1e1b7
font_02_sfnt_off00013ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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