Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0348e4d830808e3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 08:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a60fd93416e781c85e7803c516c7448 SHA-1: 04646c123157532afd85c19350e0f7c63195dd85 SHA-256: b0348e4d830808e31e646d78e61524c7112211bd9eb2e24011dcfa6c318f7559
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and IP address literals in URIs points towards a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://akbarestate.com/survey/userfiles/files/jufukowemokezemowiraj.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f818d9d31af---zutovamofepebutavopidulos.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871cba3982---791305081.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890f18acacd---migikagotiripapanes.pdfPDF link annotation
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/71319005698.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/52915656635.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/9592c4ca14765442b2017785822e852e/91383131190.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/81871559130.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811795a27cd---detusegivas.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a8ubp171f5lri1burjn3fkmd94/firel.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/49745536348.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/85ebd477b9f317324f35021705823883/vakirirugamovuxodiz.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/wisafizej.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/13700735192.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/joriworoxuwiwega.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/55651ca709880a6249797fa5c1dadb1f/janizeten.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/h68tmov1icnpo7dj3804fo8mp1/taxokeruperejeg.pdfIn PDF document text
    • https://12waktu.com/contents/files/wimavezobikakupusepogob.pdfIn PDF document text
    • https://grancom.by/upload/docs/fozorikuviwawawelu.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/pizusowajegivi.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/52346512785.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/supokaz.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/40497035829.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd496aa920---moronefiwuverajevojovuwev.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/wukow.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/59978141726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cure+for+tooth+decay+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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 16340 bytes
SHA-256: cc8ded020994c158895c1dc4b4463c9c15471df8b2e3d5ae6e0d579a8d794ea7
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 10552 bytes
SHA-256: a02c9da9444cd5b81df7ceb046539efd9002c98182b887479f3ce63fbb88c19e

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