Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9d5348394d7f68…

MALICIOUS

PDF

77.7 KB Created: 2021-09-24 09:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c285c3c3ce91a61c0792760670d29bfc SHA-1: e06c1116dbec2c7c6e7fd4d516450b60fafc55bd SHA-256: ff9d5348394d7f682bd3394559c05b1f05a7d824a558db6c92135a403329543b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm with multiple URLs pointing to disposable hosting and compromised CMS upload storage, indicating an attempt to redirect users to malicious content. The presence of these links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://premo.at/userfiles/file/42647248051.pdf In PDF document text
    • https://askisan.daynexdemo.tk/upload/files/72930788840.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/37767540391.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/soluvuguxojoduxi.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109011710015531.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/2004240912.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202195449358494.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143441453523---remakujigik.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/75758223958.pdfIn PDF document text
    • http://tiquital.com/documentos/file/45936850797.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/87114359392.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/detaw.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/14356697734.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/12523494990.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wikuliwipinaridagiwera.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/21157673832.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/verelaxonepuxawide.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/tixovexusag.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/rajatipom.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5172561de41545670ee957bbbe90f66f/89713802068.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fonojuzuzo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/adeefe346df97bdf4fd3dd0f64a177c8/gofurogunimegabenuge.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/93000195446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=empires+and+allies+unlimited+resourcesPDF 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_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 10756 bytes
SHA-256: bb8418f8e85c5cd956ea08ff865a350e549bf7731b77302f582231dd1c92bdc2
font_02_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 17984 bytes
SHA-256: 0e73fedc3323533481de661291f8674ae621af106762a0cb187bd10e01f55097