Malicious PDF — malware analysis report

Static analysis result for SHA-256 f953e47ca79e5145…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 11:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44664fe36f7a64680b8a1d8d23a5d180 SHA-1: f7c3ff5fc175794e7d97f267960af009de6313b5 SHA-256: f953e47ca79e51455b58588b376409d268cc0a1522a7958d3296c76d1ec4ee09
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF files within the URLs indicates a potential distribution mechanism for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139191402895---73427585892.pdf In PDF document text
    • http://calisnt.com/uploads/files/zutunenavavixevuruxarek.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/35620372897.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0pqcij0d98enfmq5dbqjer65ka/kibofevukexupunifupipu.pdfIn PDF document text
    • http://hidropro.hu/upload/67393472063.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/56817432375.pdfIn PDF document text
    • http://cabini.it/userfiles/files/34548301201.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b3ccf4ca28c3654c551994e5cb49b55/35117758587.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/poxivinej.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613599c89b03f---20489509205.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/tugogorebilekirojotofutu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/zifuwamoduxuf.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/lolunasitibenoxumipises.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/92686417760.pdfIn PDF document text
    • https://medpressa.ru/files/file/rinekerab.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/tamujegi.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/maxejosenisiropivab.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8393cdbc---12696192790.pdfIn PDF document text
    • http://fivelscope.net/fckimages/judigokipepidarelanefa.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/28030047746.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/keresizafidagidogi.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/jefajawifezobexo.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/36023190966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=top+5+racing+games+for+android+offlinePDF 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_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 17220 bytes
SHA-256: 01b50502c28dc39f887520ab0575f51e55a0f89515541094def03321cbfa1bcf
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 10964 bytes
SHA-256: c59846989bc31aa9352f1f54034a2ededa1a1509e084220eb50454bffc777f56

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