Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f50e8fc0be54fdd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 14:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e22d4373b91b6680e738b0330b5f84e SHA-1: ae4e334a7b9bcd6842344cc2ea5ee5a5a62c2895 SHA-256: 1f50e8fc0be54fdd5bc5bb93151c6645f1cf40a119504dfaa1987b2fec6cd461
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The PDF structure and embedded URLs suggest it's likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.tvmreza.tv/ckfinder/userfiles/files/23541447104.pdf In PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/nulefotakekepibemomagoja.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af94d5e47---sipulefivebo.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/deselokalojokesux.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/21625722942.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/fudozudamekipefune.pdfIn PDF document text
    • https://tch.lu/files/files/fipixomobu.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/18432332966.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/31679801895.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607363222263f---ruxofet.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/48725705592.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b07bab3d27f---25900623091.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/43843665970.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109050712567609.pdfIn PDF document text
    • https://agatanorek.com/files/file/zozigirogemabejinura.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215202316234461.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fp7cv3rk6r14la471hrdlkvvbj/61508935998.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/26129250818.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5tjcarqa2e60s9qv8lkvt37gb4/fosigalunifalelugo.pdfIn PDF document text
    • http://potlista.com/file/files/45782450136.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/xoduvu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b5be27fc4bfaa7f5a7c32b05932e1529/zazanuduxizov.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/55918763402.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608762110eb81---pivigevanu.pdfIn PDF document text
    • http://rurisnet.org/images/file/wulobese.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/minasuvamakawosiwibeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=precipitation+titration+notes+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_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 18296 bytes
SHA-256: 44ee8931b2370145f1580fbde786309d47659d3768852c8d70fa15dce5ed46c0
font_01_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 10568 bytes
SHA-256: 91bdaaf918fc7fd7a909cb81fd009c45e8ba80172d0dc48bc04f1eee82287d30
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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