Malicious PDF — malware analysis report

Static analysis result for SHA-256 135c21f77cbb8037…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 15:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c876d0a94e04cbadd7029d196881ed67 SHA-1: 42a5c149ed6b11dfc8dad5cf48198798881f1ca6 SHA-256: 135c21f77cbb803751e35c6829abdb73aa38383329cde6e46a6565eebda0deab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a link farm on disposable hosting and compromised CMS uploads indicates a phishing or scam-related lure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wroclawmodelshow.pl/ckfinder/userfiles/files/93607035364.pdf In PDF document text
    • http://abpjseah.news-read.com/upload/files/44491692202.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/bewanafuzibul.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/mevasuwesupibezewotebama.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/69287368477.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/majuvarexomozadatut.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/38086576939.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210909_033407.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/75486013072.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/42395776869.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/filidifaxufenovitepike.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/fezonenu.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/jonesabe.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/96769681871.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143ab1f293ce---redowofegorapobosoxujegej.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/79640500239.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/57595554421.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/4040376308.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/xuvejagawo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/83t5s9d2v0tqh3edkaun4j3dvi/87232753134.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396167b5135---31603732415.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/11745200232.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/91674348867.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/giborilugesif.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109030654388486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=imo+app+free+download+for+windows+10PDF 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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 17332 bytes
SHA-256: fa09900b9b3f22fbf47591aca5ee5b025935be88995133ae662343d3e4dc5156
font_02_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 10772 bytes
SHA-256: d394107b75be26e99e505f9032973678262a084dcea7650e48ff43f40463716e

Open this report in the interactive analyzer, or submit your own file for analysis.