Malicious PDF — malware analysis report

Static analysis result for SHA-256 de37bd11a194e963…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 19:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f1342d83fbfd9edac88e59456ade00c SHA-1: b113e2fc17780252b31f9b6ff20b9d838d1bcd3e SHA-256: de37bd11a194e963121113cb0cf78bacaa332eec2e9484062002da22132e4415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious document to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/q1iumnu20isb2s8iomo5drqei1/63173320096.pdf In PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/neguzoxazigarojalebusi.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/60220340035.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a943926f9---piwogoteratirugezu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9b7216899---javuwu.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/37343504938.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/26212731033.pdfIn PDF document text
    • http://e-sheremet.com/img/derozawimofijupipulifab.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf310a73d---65938158895.pdfIn PDF document text
    • http://nemalipics.com/14629477089.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5546d4ea20---mutubetejazibenazosuxo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c12fd8e24---galuguwarowuwosem.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/48482851762.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/rimovuxelikaxemod.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/saziga.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608331ba173d6---zaxuvar.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f117cf410cbfb8615b491cd6aeead560/42789678811.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/51020934861.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/lonit.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/37401093400.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/55853743832.pdfIn PDF document text
    • http://adveotec.com/img/file/dorokolabumezuzoliko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=half+wave+rectification+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_off0000c715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 18628 bytes
SHA-256: 1e61a5a931e3010c19b011ce10e5a36cdc9f5db80894cafc8b586375c9c07931
font_02_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 10588 bytes
SHA-256: ab33f275aec8418b092c86948a8faea91047b352c0b1eb813081cfca4ef10514

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