Malicious PDF — malware analysis report

Static analysis result for SHA-256 75254539206fa397…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 03:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bcb6902ef7a0812c2342dfe880d547ba SHA-1: 106a90f2e4bf9e83684d677d4c1e1828853ba71c SHA-256: 75254539206fa397b86c8932e9294d58f59db48fee072317483885cc99abfeeb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=parametric+equation+of+hyperbola+pdf PDF link annotation
    • https://atlaskvartir.ua/data/uploads/files/12375967865.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e874f79f61---movajimina.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/subikijukufanikiwijoxun.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/13112404271.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/59613763457.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/89798358579.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845e450a9a---4045778311.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91452330189.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40946665988.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/35136330198.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/xixikip.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7bb527133---dijej.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/49483086853.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105251322.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee39348c98---pagijekikadokebovidike.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/junovobifufofure.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/ropenalonija.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf77e78cb9---81028629994.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/lanofoguvimejaba.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vsbrv8k32vbpmog66gh9ra7l7j/posepolilufu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc6deb153c---lusunebasevile.pdfIn PDF document text
    • http://vo23.ru/upload/file/labibafovigipubur.pdfIn PDF document text
    • 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_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 11216 bytes
SHA-256: 57841a30767f822ba15f35faf25ab8444bc89f66f499b78f4cabab83db06f5c7
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 18280 bytes
SHA-256: df55ac97c3a60acaf7da654f197abc434f1a1d6b663fd892377d567a16121bad
font_02_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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