Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2e4e0e11354d30…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 03:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aae876af51f48cd53a5b9e768222724f SHA-1: ea6f7348991590061421e66145b2fe734a020edb SHA-256: fe2e4e0e11354d30c41ebdc81edb419639d3125e972bdeae650b99de29e5eb79
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be redirecting users through a network of URLs, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medicentrumnz.eu/medicentrum/files/file/metiwugepodufebamuf.pdf In PDF document text
    • http://popnmusic.fr/userfiles/file/zolakisikedagareripi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8115bdde76---zowuvakokinamivol.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/50277959443.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29551d431d---gigekemukakonuxu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/31386630191.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8b45411d---munotugug.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d3f16675---retonow.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/11544890620.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a64a44d7---lunatupekuluvu.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/28825959281.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/acdc372c6df0f7fa6d27b81e1825d82a/10815043711.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4d425973---voxoxonutubikujosujifow.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae412c74a5c---65482290435.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe87e1f4bc---derebodosefako.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gopabatimuba.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/kobepopudosizidanad.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/fda18d7e4edd293b3eb8e75b947103c6/raxopesuv.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/89634159113.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/wikarazufosexevibuwovoxip.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3fb7b87cf0411fad5d6e769e7f7886ec/52112499828.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/9a9963.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/bemil.pdfIn PDF document text
    • https://j26clean.com/upload/files/tegukubawobilezujunele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=braun+ear+thermometer+pro+6000+manualPDF 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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 17912 bytes
SHA-256: 4b7686dd60db7b8112466ee86cb9e1acc04985479f6271697398442be585eb6a
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 10700 bytes
SHA-256: bb540402f271941a5c7c40a3468241b875e0f0b29dbcc3f63ca90667b7a5fb24
font_02_sfnt_off00012d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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