Malicious PDF — malware analysis report

Static analysis result for SHA-256 87303f7f7739cda1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-24 03:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64179c2b41e544058db604d77c09c3cd SHA-1: 1b4272a899115b370b86ed986b4be5f0febe3aed SHA-256: 87303f7f7739cda1e452cd1735e2990ed07ca15949cf1e0eb0a1b1f797a990ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, designed to trick users into downloading a malicious file. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec999478e2---vuzivukemusoseduji.pdf In PDF document text
    • http://murielbellhomes.com/userfiles/files/bagowofubu.pdfIn PDF document text
    • http://afslab.asia/upload/files/24229089643.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/48155328964.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/edofrr4hrmg4ir3o76urudk465/35957663662.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/48218651795.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/79841389275.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109031502079736.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/mujedaroloxunivu.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/texifipesotasajanebiz.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/89825323479.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/luvukuwi.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/xanunavinipit.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161411b537dd3b---65652212249.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-11/20210911212748911485.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/37867489978.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/67087328932.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/ledetuxaxukide.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/74301499201.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/pawusurujumupo.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/vifapevoxiwebojamitifatij.pdfIn PDF document text
    • http://davobio.com/upload/files/60720296219.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/53063237577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ben+10+wrath+of+psychobos+mod+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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 11408 bytes
SHA-256: ddf070c480bd17b42a46ff0a2beed03e90ace2d76ab1c9d7c653707d2825af79
font_01_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 21368 bytes
SHA-256: 6c77cbf4ff7a4583b1179ba4116e0863ee92adb8b2ccb7b2279cb590f7a81684