Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88374fa0867fc72…

MALICIOUS

PDF

90.2 KB Created: 2021-08-18 16:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: cc3527790629054816318aafb6fcdb12 SHA-1: a0431390b9bbc2b6932581e729ddd9b938aa77b4 SHA-256: e88374fa0867fc723fa5c188802af001086ca5d48e295f3faa3f726002c762b1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093bae46a68a---jijewu.pdf In PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/nowopo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c204a12eb1---22140064932.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/daxowisototebasi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160746d723b0fb---vebukinefesafizowamo.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/68436738cb1f70dccbd2bb9075ba85c0/vukavebalajiresefono.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6a0953c8b139d707ec535fc106650807/57017610024.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/dofisoxovutuvolemufodu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/64709206280.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/21488983227.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/44741006463.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ccf1a751b33143f17d333a7bbdb9126/30425848983.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/kuvatawidikudobuxuj.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947d0cf8eb---dipubafazokezeram.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/66t6509tgjhvff6etvk31h9u2d/mufoxavojuzaxegoribuju.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607967e2e4caa---26290106471.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22543962ae---kisifux.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9271a8136e---palitu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/godemabuwo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2bf08ef92d91c6e4eea58f44a53fe418/dekerivomulinurava.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/15330819358.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4594e7efa4---varidujutajetofi.pdfIn PDF document text
    • http://ilkemymm.com/image/files/6410967991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=disney+magic+kingdoms+cheats+no+human+verificationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 17308 bytes
SHA-256: 193f62469897bbec69019ec34ed1ff1507c4fd7add62f65cef1815a70cbb934a
font_02_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 11248 bytes
SHA-256: 74913c5be89d49df9babc4828bdb567d91064487f12529275a7a5291c5c9adfa
font_03_sfnt_off000142fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FB 16632 bytes
SHA-256: bb6f186d1c37c052774222d95d9d6a10d2e475be35c391b5248accf015806e12

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