Malicious PDF — malware analysis report

Static analysis result for SHA-256 7197d3b5598b5cd9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 13:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10da2d4366ed0e1d8427da66392d7ad1 SHA-1: 6043a286d6e75332eb5deaece99914a66cda0786 SHA-256: 7197d3b5598b5cd948f47359ff77f2c38e1f9be291b4a789f9255996ae7b94df
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. These links are likely intended to host phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4393e15d27073dd2ffd3938a0744da88/gubilurodibi.pdf In PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimezebuxigufi.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/79673481339.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/ninexonotulatuvigiruriwuw.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/22096659783.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/revuterunolu.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/gulis.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/sowomirajasowoduwukofe.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16134d7a993ea9---dexotevotugubowe.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/dogije.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/41158229195.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ufoqu5vk8n5uk7400p48p2b3oh/tebizomirekubigenidipel.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c16d66b5c---81764101694.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/zurelakijekal.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631113168.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/44683354404.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/44230849038.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/miwirezomo.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/sotazag.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b879f695---28428671474.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c2841db1a8081c1f97cae9922042bae6/52775706720.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/mederofisipapudevisezi.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/vomatakaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+studio+open+existing+projectPDF 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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 10792 bytes
SHA-256: 5f976a0b28a67b6a95fc84621a56444415c1b25add45b710e7d7e4401fc505b8
font_01_sfnt_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 17612 bytes
SHA-256: 1dc658a016002366d841f31784982a0b92f868a7d1ee316350403b085ad5166a

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