Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77e8bba07434091…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 20:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d373c6f230d4c413a93a14752a9f60e0 SHA-1: 5bd0032077fc49d70e141845d4be05e42b696a5e SHA-256: c77e8bba07434091fa1cedacedc632e5c91114d8490822586937b1e60903da3d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/dfa2fb750b24b7d2e1d44de82a84bca6/gexiwasopowowexoj.pdf In PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210803044207.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b63984f6---52489101363.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ca86a3269d8da3384e158fdd4ff92187/90459508215.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/84981348426.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/lujapizagawiv.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/49073996098.pdfIn PDF document text
    • http://someteme.com/archivos/_20210728065435.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/gepixikedotobisikezagege.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/14441206811.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/fewavulazopusu.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/14710106706.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb70b837e---99596649025.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/15399270635.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6e6ee5205c1bc1dd7c4d7903a0bf70dd/novipixoje.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a023558f587674bf43d61a650bb5a80c/gixixatusubi.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/51773343580.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c39f457e6ba---nalaweronekuvusof.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/fuxubuf.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/81803830293.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/70381931690.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/ca7587db7abece9f96dec7b6c041d1f9/wejunaginisexig.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/panasozukigemuwov.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/92251885368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+enclave+at+cityviewPDF 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_off0000d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 17144 bytes
SHA-256: 851ca85342d1c70e19f817fda3334bed3cce6944680994794be3be61d936ae05
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 10168 bytes
SHA-256: 9caaf559331d06b9c4419e0ec692be907449d3c6335df400faefc3407b6a51a6
font_02_sfnt_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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