Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b24e775ef51744e…

MALICIOUS

PDF

95.5 KB Created: 2021-07-04 13:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 087a752f53936706417653192cafbb20 SHA-1: a359cef5311fe8902abf603dd3c949d103986daa SHA-256: 7b24e775ef51744eb0e2dcfb7302203299dbe76c1fae5b065b54ce4852040492
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS platforms. The presence of numerous PDF links and the 'utm_term' parameter in one URL suggest an attempt at SEO manipulation or directing traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://armanetti.com/images/37339699861.pdf In PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/95656689255.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/g9o5nroui8t4fh9dhq51jpu85r/573982749.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/61175410663.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/84035913834.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c9fc4a641c873c9db74e87ba34a2ee2e/xapususaxatoroso.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/kogopipuxoxig.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6691e149b065ea0a51d56b6d6b3b8292/bezumu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885ef90f16b---dibese.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb478d8819---88510175023.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/gonujuxuzadegek.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d195abd2ed---41764601464.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50beaa2f3---lepowufutome.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/34075177188.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c264d87ab07---dujovuf.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7033739b---27765903563.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5e63cf0b4e2feb9bf28daed61e37d814/vanatotutatinesirolobifeb.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/takasenapobifupezujo.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/93841849399.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087e78f0ad72---60177627192.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5goncfiajonsprt9aqv9allg5t/13171448120.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/jipitipalamurarosagifeb.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acb940c73f0---juvel.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/17667202315.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090a70667813---zataman.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/sixotob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adderall+makes+me+tired+and+hungryPDF 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_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 10864 bytes
SHA-256: 654cc38644adca10a9ad3b0eea689abbcc14ed33766f5936771d263e6ca5b7e7
font_01_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 16264 bytes
SHA-256: 1f2bc8790ab8a39e89df69bc917722b19fbcb00fc96ab28f90da3722fdb3a646
font_02_sfnt_off00015881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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