Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe051f898e003660…

MALICIOUS

PDF

97.3 KB Created: 2021-08-11 15:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4695821cb922d1c7f309ca1b5271f0c0 SHA-1: 40ce023a9de0cc1ccdba6eb66547468663f7dc8b SHA-256: fe051f898e003660fec3ad526d28c2184b3c5561e305b3682c90b6b5aa2465f4
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/27f1956d8f73da3f892565261663643a/72189897315.pdf In PDF document text
    • http://sklepjola.pl/userfiles/file/vuxupepop.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5024b0360d---85062703350.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/66650746866.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/sonil.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/vetimemetuxofirijoka.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c39205ec---wedadenunugijerilusodefuv.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/85809674124.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743adb1f92d---83422412545.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/55816806259.pdfIn PDF document text
    • https://questyme.com/userfiles/file/mulivireguwi.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/57236454216.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f3be6fb75af9661402bfdd2e914e4dd8/58017582488.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091b96f8cad4---9253416148.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0bccd7e4---xijuxanozazulo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/052571928df2e5d22d2a567aea4dc974/nakokejivamet.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/sipamuteso.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/82997313236.pdfIn PDF document text
    • https://paperland.bg/uploads/file/ligubejarenajafukaku.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gajevodojutugevavuda.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/341844008.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6b18f096---60241316327.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fdee8a289f7ec4bce5c93d6758a4a380/98420889729.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/novudoxu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/09dc88418510b545f3e97b0f3808a56a/49966348002.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/5035278862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=%D0%B0%D1%80%D0%B0%D0%BA%D0%B8%D0%BD+2+%D0%BA%D1%83%D1%80%D1%81+%D1%80%D0%B5%D1%88%D0%B5%D0%B1%D0%BD%D0%B8%D0%BA+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+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_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 11056 bytes
SHA-256: 12f3cb0961f6e995bfa0051f9c4208dd117bb4b276f3b3f0ab17fd8dbb383191
font_02_sfnt_off00013a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A45 23852 bytes
SHA-256: 5f782c6ed0e3b07b7d96befcf944a0445a586ffcd87f15209c434bd7f0374c3d