Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b87cf90e071c073…

MALICIOUS

PDF

87.8 KB Created: 2021-08-21 14:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac3925c210a9716847995ea3dcfb10d7 SHA-1: 094f76fbb33732bf09061bad18730f02adfc4fb8 SHA-256: 4b87cf90e071c07397b947bbc5d8707e0e1652367ea59e66daa89b4c5aada62f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of multiple external links, including a link farm pointing to compromised WordPress uploads and disposable hosting, suggests an attempt to distribute further malicious content or phish for information. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fultoys.com/userfiles/lubula.pdf In PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/8392395748.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/fijixesukamuxasabetowed.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/lodurebepexapupugemuja.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/50262628031.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/34812753411.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/lupojabibexeb.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba14bc101---57503343442.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/45570862621.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/govew.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c15ad4eeb4f94c3bb02b0986cce844e6/jimab.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56526c422a---22306470258.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/sigaxolatit.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/bepewoxilubore.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/28711561451.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/90849781017.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841bae6cd6c---2878965406.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/29533706681.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f67b17c703c---fabisedas.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073c29aa43e5---jonolesosituvix.pdfIn PDF document text
    • http://sro52.ru/uploads/files/34760214785.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7237a56ef---sexesewerujakez.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/700eef0298e769a12690cf00ed5c0492/mufeponubilonivosimikut.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/godepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=five+nights+at+freddy%27s+2+free+download+android+apkPDF 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_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 28308 bytes
SHA-256: 8bc4e6ae61aba4b96cfc1baf786583e939f5015b5dca29b09a96e032bf704105
font_01_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13691 11264 bytes
SHA-256: 24b6e0c562ed905c0ed5d0e02ed91d010bb1642f2c70010ea485cfb9a9d6a6c9

Open this report in the interactive analyzer, or submit your own file for analysis.