Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a40520b8d9d05c8…

MALICIOUS

PDF

96.5 KB Created: 2021-09-03 01:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e6077adb8fad6bda8c0f8405cb58f36 SHA-1: 2362f0a41b8981552251d20093fd33af67c66cbf SHA-256: 1a40520b8d9d05c8014ce479d69eac447b61ae471bb41c4ecac0d6989729175a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bedd73e7---zuxop.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea2da40158---91150312820.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/xezixuwokozaziwuse.pdfIn PDF document text
    • https://inncredel.com/uploads/lemafuroledijetozolen.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5ec320a8be326713fabc57570c887326/98941454890.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add8a89f87d---69624633623.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/48241003847.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/64993996132.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/82174024725.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/bamodenegefakojuxuzu.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/99214580110.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/tipajobekepamo.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/jatebixi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076db55de2a1---vujawedomenozibezut.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/16918611085.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/sitirefow.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7da3f253---29839158552.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/32806068702.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/26971595866.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/30259913023.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/jadaxewafurob.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf14304e23---fawurijugevud.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/felozesom.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ce90c190---29569338531.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2405e572d---wumawagegudevutemosibur.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/00b929333d445a3dd8fc3455948f3510/63330770637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lexique+anglais+juridique+pdfPDF 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_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 21068 bytes
SHA-256: 7df020cfc8cbd6afe230e4d9c6e23c971674318fae9d42fe4719345435b0d7d0
font_01_sfnt_off0001424d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A64 10892 bytes
SHA-256: 38078a8e20ae66dfe99c30deb6a62a2aef0bc8338b7289e140d5541cc1ba8e7e

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