Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c87e7f3b673e0ea…

MALICIOUS

PDF

71.8 KB Created: 2021-09-22 12:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8adaba0f0635a50252d96a448dc46d28 SHA-1: abe02b5d2f2c2b4f443b27fa47b3edcd28c6ab8c SHA-256: 8c87e7f3b673e0ead34403243709d9be3b13c438894580a82e859dba4cdc91a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics suggest it is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=code+fortnite+v+bucks+free PDF link annotation
    • https://tradegateindia.com/userfiles/file/72435229756.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/10493176633.pdfIn PDF document text
    • http://master-vin.ru/files/file/pijiziles.pdfIn PDF document text
    • https://menu2uplus.com/images/file/sexabipof.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161421ddddc57d---39243171478.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/22709026273.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/op7matgfqbchtfp0md0gvqtbnk/zizigamekimej.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/61067663689.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210909_c1923.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/30295233279.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/45270163679.pdfIn PDF document text
    • http://salt17.com/userfiles/files/ketimuluxadizixesus.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e8e88a14---79280596213.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/moguvanodad.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/95645515906.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146c5624d7cb---34857716705.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482551a1724---88871204594.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/biwamifufivugefuni.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/15019516159.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/14999543545.pdfIn PDF document text
    • http://savemaxint.com/files/file/85073529369.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jevodubuxomefus.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/rukoborubofivaf.pdfIn PDF document text
    • 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_off0000b5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 10688 bytes
SHA-256: db080e25591a2a995ad9d34a897840594f4c16c9e2f7377efbffe12bfd7d55a3
font_02_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 16760 bytes
SHA-256: 15d872564fa674848d9d48a72983f1809a01c2fe039a0e4fbbac8427aab74f00