Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bd2f2a351189b7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 14:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7df9c51b7a48a1ed3222a49f3f9be52 SHA-1: 473c45be21016b9cdf1e01dac6726f8192421870 SHA-256: c7bd2f2a351189b70ecf858bccb1c897b38e5da4a27b6d7d5c49f9bf8266a332
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://majorsagilekvaros.hu/uploads/file/gasevujux.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea7b9449e---34808085472.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/lukilafokofi.pdfIn PDF document text
    • https://renewone.de/files/rogaroxewalebogodas.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f654227da4---46725683367.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c55590102b9554c0a162ef39a1a6db9f/pipefonefebupikovifapix.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/wofovovewanagilapabepuju.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/sivodedogelanoloke.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/36536263963.pdfIn PDF document text
    • http://garderoba.sk/images/_file/92930435913.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/wiloratolepa.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109090930053242.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/pavakumafodana.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/31611028148.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/dewipuzefopin.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/82057418954.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/moxubuzumigogosejedute.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/parutisudotufiz.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/mumeremaku.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/15360281121.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/5625360223.pdfIn PDF document text
    • https://ms1oke.com/contents/files/rijufewogezosefu.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/81532799063.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/galuzosuramogovufokajikim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=multiplayer+driving+simulator+mod+apkPDF 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_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 11100 bytes
SHA-256: 86d1dc25634f7f159e78ee851c30ff0c9acdb37481222c7a1e966adfd305fcbe
font_01_sfnt_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 15692 bytes
SHA-256: 242852b2c6c0e5d524d003c06385fbede2fdf2060cee1e32c87b9d0e194dc4ef
font_02_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1