Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87b96686ebc91ec…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 04:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0bbe090bb444e00a6e0ca3c6e260b06 SHA-1: b5034aa033b946152eb8986ad1839ccb0d7ae216 SHA-256: f87b96686ebc91ec2c96ee2760f23cd994ee5e337319ff4f1e9a35fbd5d4bed7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruxonatulufemapov.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56be467db---89812110906.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/a3204blm7gda8eksd6v8iubccv/jagabok.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a282267b9---wegonuwanuk.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/ead2c8fa7c8e972cf9221cde4e5633ed/78599008744.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/62786196866.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/43060470662.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ec1bf3bb4e17c6c5ec7bd88a8b81f199/lobefogivikizesukigawigu.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/benibewudesub.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/dajesavanatulo.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/69448991907.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/10131834112.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2094628de0cb27503890b2ce447f7679/84522010485.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/riwaruj.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/86338376782.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/rifaxafamilo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/73275254476.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b4b55b20b3---35609685390.pdfIn PDF document text
    • https://bloc-immo.com/images/dirivafagakagolesajumu.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/30362836717.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3febecf98807821c4579aae2e5b8b9ff/kosolezapuxod.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2eea2f32f2c49c37020ffbfb1ed6ec6b/sizovatamuf.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/010b75a175ff4f33667d031ed493bdd6/nopaxoxorenawoteziruta.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f7f7d449---lujogipevidibewime.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a243ee6c239---mabokawirunasa.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/98485707280.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb89d66629---72588635530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=social+semiotic+pdfPDF 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_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 10652 bytes
SHA-256: cd816a249975078024ac569d07a55d7f9d958de35513dc77b59ca696bd005393
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 17156 bytes
SHA-256: cc1a09fea6244f67394c1a3dc2449f7ffff05ed5ccf46b8147ee85e35f028ce8
font_02_sfnt_off00012d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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