Malicious PDF — malware analysis report

Static analysis result for SHA-256 128b153807cb8dee…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 01:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b034b7bac85e8c46e553d68545a4f33 SHA-1: 17b5fb8eca7bfaea65e1c9f1415cd489e3fc76fa SHA-256: 128b153807cb8dee5e5e589e63349bcf82d76a38b4d81e26b12cde4a4ba23e1c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress upload directories and other disposable hosting sites. The primary attack pattern involves luring users to these sites, likely to deliver further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee891634cfa---xasepelamofaki.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609804747b489---lezelixemariwefoduliwobun.pdfIn PDF document text
    • http://crediramasrl.it/public/file/26645822101.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1c7fa11857bd12050347375c9a25553f/libugalotijedonasoli.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/56319357236.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/39770720492.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/67945727989.pdfIn PDF document text
    • http://mosjob.ru/images/file/39497473366.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10006e6d76---81989232001.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee117f678---tabebi.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/gadudowarokabuxujilower.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/midawupifum.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/buzetinuxatisifugido.pdfIn PDF document text
    • https://faceless.me/userfiles/files/17260679559.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/99882518186.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/61089721209.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e50bef438---susamowu.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/92146193654.pdfIn PDF document text
    • http://4darchitecture.org/img/all/24335236725.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/solekakajorefa.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/95539340051.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161133b14502f6---87727557340.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/10752822274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+love+song+of+j.+alfred+prufrock+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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 11124 bytes
SHA-256: 16e1ed8654fd02684cf99eddab4ae6c153c7e98443e6a59d9a6ace4008e55679
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 18288 bytes
SHA-256: 9ece0e2817d1623c3af1743c7734815ec48b045f6a0cb81bc892de83e7808c94
font_02_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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